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PC Won't Turn on, But Motherboard Light Is on/It's Plugged In

Updated by Roxanne on Sep 22, 2022

Workable Solutions Step-by-step Troubleshooting
Fix 1: PC Won't Turn on, But Motherboard Light Is on

Method 1. Check the Power Button...Full steps
Method 2. Check the Screws on the Motherboard...Full steps
Method 3. Check the Memories...Full steps
Method 4. Check the CMOS Battery...Full steps

Method 5. Check the IC Fuse...Full steps

Fix 2: PC Won't Turn on, But It's Plugged In Method 1. Check the Cable...Full steps
Method 2. Check the Power Source...Full steps
Method 3. Check Your Monitor...Full steps
Method 4. Listen to the Beeps...Full steps
Method 5. Check the Inner Problems...Full steps
Bonus Tip: Check the System after Turning on the PC Step 1. Right-click the target partition that has a problem. Step 2. Choose "Advanced" > "Check File System"...Full steps

Why My PC Won't Turn on But Motherboard Light Is on/It's Plugged In

One of the most frustrating things that can happen to a computer user is finding that their PC won't turn on, but it is plugged in, or the motherboard light is on. This often indicates that there is a problem with the power supply, which can be a real pain to fix.

However, there are a few potential causes of this problem. In the following part, we will offer some possible fixes for this problem. Try the following methods to fix this error!

Finally, if none of these things work, you may need to contact a qualified technician for further diagnosis and repair.

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Fix 1: PC Won't Turn on, But Motherboard Light Is on

If your PC won't turn on, but the motherboard light is on, it could be for several reasons. One possibility is that the power supply is not providing enough power to the PC. Another possibility is that there is a problem with the motherboard itself. One of the PC's components is also possibly faulty and needs to be replaced. A faulty fuse can also cause the problem. Here we offer some methods to check and turn on your computer successfully.

After reading, it's best to consult a professional for help if you're unsure what the problem is. With their expertise, they'll be able to diagnose the problem and get your PC up and running again in no time.

Method 1. Check the Power Button

One potential reason why your PC won't turn on but the motherboard light is on is because of an issue with the power button on the case itself.

If you find no faulty connections or connection breaks from the main source, you may need to replace the power button. In either case, it's generally a good idea to consult with a professional before proceeding, as working with electrical components can be dangerous.

power button on computer

Method 2. Check the Screws on the Motherboard

If your PC won't turn on, but the motherboard light is on, one possible reason is that you're using the wrong screws for the motherboard standoffs. To check this, take the board out of the case and try turning it on with a screwdriver. If it works, put it back in with the correct screws. Once you've used the proper screws, everything should be fine.

check screws on motherboard

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Method 3. Check the Memories

It could be due to incompatible or faulty memory when your PC won't turn on, but the motherboard light is on. If you have recently installed new memory, try removing it to see if that fixes the issue. If you have more than one memory module, try removing all but one to see if that makes a difference. You can also try swapping out the memory module for a different one to see if that works. If none of these solutions work, then the problem may lie with the power supply, motherboard, or some other component. Try different methods in this article, or contact a professional for further assistance. 

check memory in computer

Method 4. Check the CMOS Battery

A faulty CMOS battery is a potential reason your PC won't turn on, but the motherboard light is on. The CMOS battery helps to power the BIOS chip, which is responsible for booting up the PC. If the battery is old or faulty, it may not be able to provide enough power to the BIOS chip, causing the PC to fail to start up. Try removing and reseating the CMOS battery to check if this is the problem. If this doesn't work, try replacing the battery with a new one. By troubleshooting each of these potential issues, you should be able to get your computer up and running again in no time.

cmos battery

Method 5. Check the IC Fuse

A blown fuse may also prevent your computer from turning on properly. Check the power supply unit (PSU) for any burning smells. If you notice a burning smell, chances are that one or more of the PSU's internal components have blown. You'll need to locate the blown components and replace them with new ones. And remove any unnecessary cables, such as those from an unused CDROM drive. This method is more difficult for users who lack computer knowledge. You can bring your computer to a specialized repair center for testing. 

ic fuse

Fix 2: My Computer Won't Turn on, But It's Plugged In

There are several reasons why a PC won't turn on even when it is plugged in. One reason could be that the power cord is not correctly plugged into the PC or the outlet. Another possibility is that the PC's power supply has failed. Sometimes, the PC won't turn on, but it is plugged in because of a virus or malware infection. In this case, you will need to run a virus scan and remove any malicious software from your system. You may find a suitable solution in the following part. If you are unsure of what the problem is, it is best to consult with a computer technician who can diagnose and fix the problem.

Method 1. Check the Cable

Check the power cable first - it may be loose or disconnected. Ensure the cord is firmly plugged into the PC and the outlet. If it is, try unplugging and replugging the cord to see if that solves the problem. If you have a spare power cable, it might be a good idea to swap it out. If the PC still doesn't turn on, check to see if there is a switch on the power cord that may have been accidentally turned off. If everything looks to be in order with the power cord, the next step is to check the PC's power source. If you're unsure how to do this, read the following method.

check the computer cable

Method 2. Check the Power Source

Unplug your computer and plug it directly into a wall outlet you know is working. Make sure the power switch on the back of the power supply is flipped on. If the outlet is connected to a light switch, make sure that the switch is turned on too. If that doesn't solve the problem, try plugging the PC into a different outlet. If that doesn't work, check if the power cord is loose or defective. Finally, you may need to replace the power supply if all else fails.

check the power

Method 3. Check Your Monitor

Check your monitor if the computer sounds like it's turning on, but you don't see anything on the screen. You'll also want to check that the cable connecting your monitor to your PC hasn't come loose, become damaged, or is at fault. If you can connect another computer to your monitor and get a picture, it may be the cable that needs replacing. If none of these solutions work, the issue may be with the computer itself, and you'll need to try other solutions.

connect computer to monitor

Method 4. Listen to the Beeps

You may go through a single beep when you first turn on your PC. This is usually an indication that the PC is working as it should. However, if you hear a long tone or a series of beeps, similar to Morse code, it likely means something is wrong. Check your PC's manual or go to the manufacturer's website to see what the sounds mean. In some cases, you may be able to continue using your PC without any issue. However, if the PC is not working as it should, it is best to consult with a professional to avoid any further damage.

Method 5. Check the Inner Problems

Faulty internal components can cause the problem. This could be a broken or damaged motherboard, damaged charging circuits, a defective video card, or software issues. If you've recently opened the computer and touched any components, static electricity may have caused damage. If you suspect an internal component is causing the issue, take the computer in for repairs or speak to the manufacturer for warranty and replacement details. In some cases, you may be able to troubleshoot and fix the problem yourself. For example, if you think static electricity might be the issue, you can try unplugging all of the components from the motherboard and plugging them back in again. You can also try reseating the RAM or replacing the battery. If you're uncomfortable working with PC components, it's best to leave it to the professionals.

[Further Reading]

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Bonus Tip: Check the System after Turning on the PC

After solving the problem when the PC won't turn on, but the motherboard light is on, you can check the system after booting it up in case a similar situation happens again.

EaseUS Partition Master is a versatile tool that can help you check the system. It can be helpful if you're experiencing any problems with your computer or just want to ensure everything is in good working order.

Free Download 

Windows 11/10/8/7100% Secure

Step 1. Right-click the target partition that has a problem.

Step 2. Choose "Advanced" > "Check File System".

Step 3. Confirm if you want to hide the partition or not.

Step 4. In the Check File System window, check the "Try to fix errors if found" option.

Step 5. Click "Start" to check errors on your partition.

Besides checking the file system, EaseUS Partition Master can also help you resize, create, format, and delete partitions. It's a handy tool to have around, saving you a lot of time and frustration.

Conclusion

One of the most upsetting things that can happen when you're trying to use your PC is when it won't turn on, though the motherboard light is on or it is plugged in. There are a few different things that can cause this problem, and in this article, we'll introduce some fixes for you. Try the solutions above and solve your problem. If none of these solutions work, then you may need to take your computer to a qualified technician for further diagnosis.

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About the Author

Updated by Roxanne

Roxanne is one of the main contributors to EaseUS and has created multiple posts on digital devices like PCs, Mobile phones, tablets, Mac, etc. She loves to share ideas with people of the same interest.

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