Troubleshooting Sometimes PC does not turn on.

Hardware Troubleshooting
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Junglist

Junglist

Level 2
Setup PC setup
Describe the problem
PC won't turn on sometimes.
What have you tried?
Case power button replaced. Surge protector replaced.
Current antivirus and security software
Win 10 Security
Hello

Sometimes my parent's PC won't turn on. The power button is pressed and nothing at all happens, no sound or lights. I have replaced the case power button and also the surge protector but the problem persists. The monitor, also plugged into the surge protector has no problems turning on. If the PC cable is unplugged and re-plugged into the same socket on the surge protector it will turn on after the power button is pressed. There are no problems once the PC is running, although it's only used for web browsing. The PSU (Seasonic S12II Bronze 430W) was bought in 2017. Should I just replace it, or is there something else I should consider?

Thanks for your help.
 
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Is your windows shutting down properly. If it happens from time to time, and you have replaced the button and surge protector, before spending any more money i would suggest looking in windows event manager, look for times around shutdown for any errors. If this is happening when you press the power button you are actually forcing a shutdown to complete, until the process finishes you will not be able to start the machine.
 
Upvote 1
Thanks for the replies.

Ultimate Vision said:
...i would suggest looking in windows event manager, look for times around shutdown for any errors. If this is happening when you press the power button you are actually forcing a shutdown to complete, until the process finishes you will not be able to start the machine.
Click to expand...
I had a look and there seems to be no problem with shutdown errors.
 
Upvote 0
Junglist said:
If the PC cable is unplugged and re-plugged into the same socket on the surge protector it will turn on after the power button is pressed.
Click to expand...

If this behavior is consistent, try another socket on the surge protector, as well as bypassing it and plugging directly into the wall outlet. This will at least definitively rule out the surge protector if the same thing happens from the wall outlet. I doubt it is the surge protector, but this is a quick and easy troubleshooting step.
 
Upvote 0
wat0114 said:
If this behavior is consistent, try another socket on the surge protector, as well as bypassing it and plugging directly into the wall outlet. This will at least definitively rule out the surge protector if the same thing happens from the wall outlet. I doubt it is the surge protector, but this is a quick and easy troubleshooting step.
Click to expand...
I've changed sockets and I've used two new surge protectors, without any difference.
 
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Junglist said:
Yes and I can confirm the connector is seated correctly.
Click to expand...
Try unplugging that connector at the motherboard and touch the two pins on the motherboard for 1-2 seconds with a flathead screwdriver, if the until comes on it's a faulty power button/cable, if not try testing the PSU with this method listed below.

www.wikihow.com

How to Check a Power Supply: PSU Tester, Paperclip, & More

A step-by-step guide to testing your PC's power supplyIf your desktop PC won't turn on, is stuck in a reboot loop, periodically powers down, or gives you frequent blue screen errors, you might have a failing or dead power supply (PSU)....
www.wikihow.com www.wikihow.com
 
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Upvote 0
Ultimate Vision said:
Try unplugging that connector at the motherboard and touch the two pins on the motherboard for 1-2 seconds with a flathead screwdriver, if the until comes on it's a faulty power button if not try testing the PSU with this method listed below.

www.wikihow.com

How to Check a Power Supply: PSU Tester, Paperclip, & More

A step-by-step guide to testing your PC's power supplyIf your desktop PC won't turn on, is stuck in a reboot loop, periodically powers down, or gives you frequent blue screen errors, you might have a failing or dead power supply (PSU)....
www.wikihow.com www.wikihow.com
Click to expand...
It usually turns on, just sometimes it doesn't. I've done the screwdriver test before and it turned on so I changed the power button, but the problem remains. I'll test the power supply when I get the chance.
 
Upvote 0
Junglist said:
It usually turns on, just sometimes it doesn't. I've done the screwdriver test before and it turned on so I changed the power button, but the problem remains. I'll test the power supply when I get the chance.
Click to expand...
If it's not the power supply and not a constant issue, I would state the motherboard itself may be slowly faltering.

You checked event viewer for signs of errors/improper shutdowns.
You tried other connections on power strip, other outlets, replace power button, cmos battery, checked connection of connector at pins on motherboard for it being seated and if it would start being jumped across.
 
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