Power Supply Not Turning On When Connected To Motherboard [Solved]

When Power Supply Not Turning On When Connected To Motherboard, it means that either a screw shorted out the PSU during installation or another metallic short occurred after the Motherboard’s connections were all disconnected. First, ensure there is no physical damage to the Motherboard by visually inspecting the 24-pin connector.

Power Supply Not Turning On When Connected To Motherboard

If there was a short on the motherboard, the PSU would immediately turn off to protect the 24-pin motherboard socket from damage. Thus, the PSU would not work. A short can occur when a motherboard screw shorts out to the computer casing or when other obstructions short out the Motherboard.

Understanding Power Supply Failure

Let’s examine some of the most typical issues that you could run into and how to fix them.

1. Overheating

Overheating is one of the most common issues with power supplies. PSUs can overheat, particularly when they’re operating at a high load. If this happens, the PSU may shut down or even break down entirely.

A malfunctioning fan, excessive dust increase, or inadequate ventilation are just a few of the causes of overheating. Make sure your PSU is clean and well-ventilated, and if needed, think about adding cooling fans to prevent overheating.

2. Power Surges

Power surges can harm your devices, including your PSU, and happen when the voltage in your house or place of business increases unexpectedly. Equipment fails too soon as a result of surges. Heat can be an indication of a power spike, but it cannot be apparent until failure.

Among other things, bad wiring, lightning strikes, and power outages can all result in power surges. Investing in an uninterruptible power supply (UPS) or surge protector can help shield your PSU from power surges.

3. Underpowered PSU

Your system won’t get enough power from a PSU that isn’t powerful enough, which can cause crashes, freezes, and even hardware damage.

Make sure to verify your system’s power needs before buying a PSU to avoid this. Consider upgrading your PSU if you’re upgrading an older system to make sure it can manage the higher power demands.

4. Loose Connections

Another frequent issue with power supplies is loose connections, which can be brought on by damaged cables or slack connections between equipment.

Electrical shocks, gadget malfunctions, and power outages can all result from loose connections. Make sure your wires are connected firmly at all times to prevent loose connections and check them frequently for wear and tear.

5. Reversed Polarity

When a power supply’s positive and negative inputs or outputs are linked incorrectly, reversed polarity results. This can cause some components to fail, like electrolytic capacitors, which are intolerant of it.

In the worst-case scenario, such as broken circuits or electrical fires, the load may sustain harm if the power supply’s output connections are reversed.

Why Is My PC Power Supply Not Turning On?

A faulty outlet or power supply can cause your pc power supply not to turn on. To resolve the issue try the following solutions:

Step 1: Check Your Cables

• Verify that the power switch is on and that any surge protectors or power strips are properly hooked into the socket. Verify that additional devices are functioning properly by plugging them into the power strip.
• Verify again that the power supply on/off switch on your PC is turned on.

Step 2: Internal Wiring

Check your build for loose or faulty cables next. Opening a prebuilt PC may void your warranty, so consult your system maker before opening it. Before doing anything else within your computer, disconnect the power supply wire from the outlet.

Disconnect computer peripherals such as keyboards, mice, external hard drives, and monitor cords. USB devices or display cables can create power issues, so if your PC boots without them, plug them in individually and test until you find the problem peripheral. Then try booting without it or with a replacement.

Not working? Unplug your computer from the wall and open your case to see your internal components. To access your PC’s interior, follow any applicable documentation and instructions.

After opening your case, examine all the power supply-to-PC component connections for looseness and reseat them. If you have a modular PSU, make sure the wires are properly seated on the PSU side as well. Check your PC’s power after securing everything.

Step 3: POST Codes, Motherboards, and Hardware Tests

Lights on the inside hardware may indicate that your machine is getting electricity but not turning on. Follow the procedures below if your system still doesn’t respond to the power button on your case or turns on for a second before shutting off.

Beep and POST Codes

Built-in tests can assist in diagnosing PC boot issues. Your motherboard maker communicates internal hardware test findings via POST and beep codes. These signals can help identify hardware faults preventing your PC from starting.

POST codes normally have two numbers that indicate when the system met a hardware issue while booting, which might help diagnose the problem.

If the POST code indicates a memory initialization error, troubleshoot RAM. Many motherboards contain a hexadecimal display that shows the code and where to start diagnosing. You can use a POST test card in a PCIe slot to display the code if your Motherboard doesn’t have one.

Beep codes sound like POST codes. Your PC may beep when it starts up. These audio signals have the same diagnostic utility as POST codes; three beeps may indicate no video card detected; therefore, reseat your GPU.

These signs can be useful, although motherboard manufacturers use various codes. Check your motherboard paperwork or search online for your motherboard manufacturer’s codes to determine the issue.  

Motherboard BIOS Updates

If you’ve done the procedures above and still have no POST code, update your Motherboard’s BIOS. You can usually upgrade your Motherboard’s BIOS even if your PC doesn’t POST.

Your motherboard manufacturer’s instructions or web search will help you find the latest BIOS version for your system. If you’re building a PC and it won’t start, especially if you’re using an older motherboard, make sure you’re using the latest BIOS.

Step 4: Power Button

The case power button or wiring connecting it to the Motherboard may be to blame if your PC won’t switch on yet the motherboard light is on. Check for a motherboard power button. Not all do; check your motherboard manual if you can’t find it. This power button turns the machine on like a wired one. If this works, your case is the issue.

Step 5: Test Your Components

If your computer still won’t start, test each component. We tested all the power cables earlier, but this is different. We eliminated power supply wire defects with that procedure. We’ll verify the motherboard connections and make sure all gear is talking with the system.

Disconnect your GPU, storage, I/O, and all but one RAM stick from the Motherboard’s first RAM slot. Your PSU should power your Motherboard and CPU, but otherwise, remove all non-essential components. If this simple arrangement boots your PC, add one piece of hardware, test it, and then shut it down.

Replace the RAM module at least once, as the stick may be the problem. This process should continue until your system fails to boot, revealing the issue. If your computer POSTs with everything but the malfunctioning hardware, you can diagnose or upgrade the hardware.

New PSU Is Plugged In Motherboard but Won’t Turn On

There are multiple reasons why a PC refuses to switch on even when it is plugged in. One explanation can be that the power cord is not inserted into the outlet or the PC properly. The failure of the PC’s power supply is a further possibility.

Sometimes, a virus or malware infection prevents the PC from turning on even though it is plugged in. In this scenario, you will have to clean your PC of any unwanted software and do a virus scan. The section that follows might provide a workable answer.

Method 1: Check the Cable

First, look for any loose or disconnected electrical cables. Make sure the cord is securely inserted into both the outlet and the PC. If so, see if the issue is resolved by disconnecting and replugging the cord. Replace the power cable if you have an extra one.

Look for a switch on the power cord that might have been inadvertently switched off if the computer still won’t turn on. The next step is to examine the PC’s power source to see if the power cord is functioning properly. See the method below if you require help with this.

Method 2: Check the Power Source

Your PC should be unplugged and plugged straight into a functional wall outlet. Verify that the power supply’s back-panel power switch is turned on. Verify that the light switch is switched on if the outlet is linked to one.

If it still doesn’t work, try plugging the computer into a different outlet. Check to see if the power cord is broken or loose if that doesn’t work. Lastly, if everything else fails, you might have to replace the power supply.

Method 3: Check Your Monitor

If the computer sounds like it’s powering on, but nothing is visible on the screen, check your monitor. Additionally, make sure that the cable that is used to connect your PC and display is not broken, loose, or malfunctioning.

If you can see a picture on your monitor when connecting a another computer, the problem might be with the cable. You may need to attempt other remedies if none of these resolve the issue, which could be related to the computer itself.

Method 4: Listen to the Beeps

When your computer first turns on, it can beep once. This typically means that everything is operating on the PC as it should. On the other hand, a prolonged tone or a string of beeps that resemble Morse code usually indicates a problem.

Look up the meaning of the sounds on the manufacturer’s website or in the handbook that came with your PC. You can use your PC normally in some situations. To prevent more harm, it is best to speak with a specialist if the PC is not functioning as it should.

Method 5: Check the Inner Problems

Internal component flaws may be the root of the issue. Possible causes for this include a malfunctioning or broken motherboard, damaged charging circuits, a faulty visual card, or software problems.

Static electricity may have damaged the computer if you recently opened it and touched any parts. Take the laptop in for repairs if you think an internal component is a problem, or contact the manufacturer for information on warranty and replacement.

Sometimes, you can diagnose and resolve the issue on your own. For instance, you can try disconnecting and replugging every component from the Motherboard if you suspect static electricity is the cause of the problem.

Resetting the RAM or changing the battery are more options. It’s recommended to leave working with PC components to the experts if you’re uncomfortable doing so.

My PC Is Not Turning On, But The PSU Is Working: What Should I Do?

First, make sure the Motherboard, graphics card, and other parts are all correctly connected to the power lines. Make sure the cables are securely inserted and unharmed.

Try taking out the Motherboard’s CMOS/BIOS battery next, giving it a minute to settle, and then replacing it. Sometimes, boot troubles can be fixed by doing this and resetting the BIOS.

Examine the Motherboard for any clear damage, such as bulging or leaking capacitors, if the problem continues. Additionally, make sure the CPU is put correctly and isn’t overheating.

If the problem continues, the Motherboard can be the cause of the trouble. To identify the issue, you can replace it with a known-to-be-functional alternative. As an alternative, you should bring it to a repair shop so that it can be properly diagnosed and fixed.

How Do I Know If My Motherboard Or Power Supply Is Bad?

It might be challenging to determine which component in your computer is faulty, particularly when multiple defective components cause the same symptoms.

You may utilize certain techniques to make sure your motherboard and power supply are operating as they should. The steps below will help you determine whether your motherboard or power supply needs to be replaced:

Look for signs of power supply breakdown

Your computer may have a faulty power supply unit if it won’t switch on, keeps restarting or bluescreening makes odd noises or smells burning. Unplug your PSU from the outlet and turn it off. After switching the off switch on the back of your PSU, take out it from the wall outlet. Take off your computer’s casing to get to the PSU.

The majority of cases feature an easily removable side panel that allows access to the computer’s internal parts. Unplug every cable coming from the PSU. Consider snapping a photo of your computer if you are not very knowledgeable about computer parts so that you can easily recall the locations of all the PSU cables.

Create a “U” shape with a bent paperclip. This paperclip can fool your PSU into believing it is turned on, so you may test it. Examine the PSU’s 24-pin connector for the green and black pins. The largest PSU connector, measuring 24 pins, is plugged into the Motherboard.

In addition, there are several black pins when there should only be one green pin. Put the paperclip’s end into each of the pins. When you plug your PSU in and turn it on, you will be able to jump-start it by connecting the two pins with a metal piece.  

To thoroughly test your PSU, make sure that before turning it on, all other devices are disconnected one last time. Verify whether your fan is in motion. Your PSU is turning on if your fan is spinning. If not, disconnect the power supply, check where you placed the paper clip, and repeat the test. Should the fan remain motionless, your PSU is most likely dead.

How to Check If Motherboard Is Receiving Power?

• Verify that the power supply and Motherboard are correctly connected.
• Verify that the outlet is providing enough power for the power source.
• Look for any indications of damage or loose connections on the power supply wires.
• To check the power supply’s voltage output, use a multimeter.
• You should consider changing the power supply if the Motherboard is still not getting power.

Common Issue of PSU Won’t Turn On When Connected To Mobo

Follow these actions to confirm:

• Connect every PSU connector to the board and its components.
• Attach the Motherboard’s front panel connectors to the casing.
• Attach PSU to wall
• Flip on the power supply unit.

To rule out problems with the case power button, double-check the connections on the front panel and attempt to short the motherboard pins where it is plugged in using a screwdriver.

As an aside, if you don’t plug in the GPU (and make sure the monitor is plugged into the GPU), you won’t be able to proceed. There is no integrated graphics on the Ryzen 5 2600; without a GPU, there will be no output.

How To Fix Powersupply Not Turning On When Plugged Into Motherboard?

The motherboard or power-on switch header is the issue if the power supply turns on when attached to a tester. Check to confirm the power-on header’s case power switch is operating properly and shutting off the circuit. Alternatively, you can use a flat-bladed screwdriver, for example, to jump across the two header pins to close the circuit.

Power Supply Won’t Turn On When Connected To Motherboard

Upon connecting your power supply to the Motherboard, if it remains off, there may be several problems. Examine connections and conduct component tests to identify and efficiently address the issue.

What Are The Possible Reasons For Motherboard Not Working With PSU?

Examine the following potential reasons to determine and resolve the issue.

Power Source Is Incorrectly Plugged In

Your computer won’t turn on if the power outlet is not hooked to it properly. Verify that the electrical cord of the laptop is fully inserted into the outlet. The power outlet may also be a difficulty.

To ensure that the power outlet is truly supplying power, plug in an item such as a phone charger when your phone is plugged in. An alternative would be to plug in a bulb or some other electronic gadget that makes it obvious to the user whether it is functioning.

Tripped Circuit Breaker or Fuse

When a computer is first turned on, it can consume a lot of power, and this can frequently cause a circuit breaker or fuse to trip. To make sure that the system’s power outlet was not tripped, test your circuit breaker.

Press the outlet’s reset button to see if the breaker has tripped. If your outlet lacks a reset button, you can reset it by finding your circuit breaker panel, which is typically found in your home’s basement.

Faulty Connections

Examine your computer’s Motherboard for any loose or damaged connections if you have examined the power supply and the system is still dead. Examine the Motherboard’s connections using the Computer Motherboard Replacement Guide.

Faulty Motherboard

With a known-good power supply, if the system stays entirely dead, the Motherboard most certainly has a flaw that needs to be fixed. To replace the malfunctioning Motherboard in your computer, use the Computer Motherboard Replacement Guide.

Why Is My Computer Not Turning On but the Motherboard Has Light?

There are a few possible causes if your PC won’t switch on yet the motherboard light is on. One possibility is that the PC is not receiving enough power from the power supply.

There is also a chance that the Motherboard is having issues. It’s also possible that one of the PC’s parts is broken and has to be changed. A blown fuse could cause the problem. Here are a few ways to successfully verify and turn on your PC.

Method 1: Check the Power Button

A problem with the power button on the case itself could be the cause of your PC not turning on even when the motherboard light is on. Replace the power button if there are no broken or malfunctioning connections coming from the primary source. In any scenario, it’s a good idea to speak with an expert before moving on because working with electrical components can be risky.

Method 2: Check the Screws on the Motherboard

You may be using the incorrect screws for the motherboard standoffs if your PC won’t switch on but the motherboard light is on. Remove the board from the case and attempt to turn it on using a screwdriver to verify this. If it functions, replace it using the appropriate screws. After using the correct screws, everything ought to work out.

Method 3: Check the Memories

If the motherboard light is on but your PC won’t switch on, it can be the result of defective or unsuitable RAM. Try uninstalling any newly added RAM to see if it resolves the problem. Try pulling out all but one memory unit if you have many memory units and see if it works.

To test if it helps, you may also replace the memory module with a new one. Should none of these fixes resolve the issue, the Motherboard, power supply, or another component can be the source of the problem. Try some of the other strategies in this post, or get help from a professional if you need it.

Method 4: Check the CMOS Battery

Your PC may not power on even when the motherboard light is on if the CMOS battery is malfunctioning. The BIOS chip, which powers the computer when it boots up, is partially powered by the CMOS battery.

The PC might not boot up if the battery is malfunctioning or outdated and cannot supply the BIOS chip with enough power. To see if this is the issue, try taking out and reseating the CMOS battery. Try installing a fresh battery if this doesn’t work. You should quickly be able to restart your computer by troubleshooting each of these possible problems.

Method 5: Check the IC Fuse

Another reason why your computer could not switch on properly is a blown fuse. For burning odors, check the power supply unit (PSU). One or more internal PSU components have likely exploded if you smell burning.

Finding the damaged parts and replacing them with new ones will be necessary. Moreover, cut off any cords that aren’t needed, including those from a CDROM drive that isn’t being used. Users with little experience with computers may find this strategy more challenging.

Why Won’t My PC Turn On Even Though It’s Plugged In?

If your PC won’t power on even when it is plugged in, try the following four steps:

Confirm that your power strips or surge protectors are operational

The next step is to examine your power strip or surge protector if the problem persists. Make sure these gadgets are turned on and operational because they tend to turn off without warning. Try directly plugging the computer into a wall outlet if they aren’t already.

Verify that the laptop charger’s LED is lit if you have one

This can occasionally be found on the end that connects to the computer or on the plastic transformer box. If it’s not lit, there might be a problem with the power supply.

Verify that the outlet you are using is operational and that there are no damages to the cord. Try plugging it into a different outlet if everything appears to be in working order. To rule out a dead battery, let the charger be plugged into the laptop for a time if the LED is lit.

Examine whether the PC is overheated

Your computer can be overheating if it hasn’t turned on after being on for a long. This is particularly typical while using laptops. Before attempting to turn your computer back on, switch it off and let it cool down for at least an hour.

Verify that the power button on your PC is operational

Another common problem of computers not turning on is the power button. Check that pressing the button feels usual and that it is not fixed in the on position. The button will require to be changed if it appears to break or is not working properly.

Conclusion

A very important part of building a PC or starting up a mining rig is connecting power to the Motherboard. To do it right, you need to know why PSU won’t turn on when i plug it into the motherboard. Multiple solutions regarding this issue have been discussed in this article.

Every step is significant for the general firmness and performance of your system, from discovering the power connectors on the Motherboard to ensuring the power cables from the PSU are attached correctly and safely.

Frequently Asked Questions