If all else fails and your PC still spontaneously reboots itself on a random basis, then there is only one thing more that can cause it - Big Mama board is busted. This is now the right time to replace the poor motherboard. But as said in the second post, it would be better if you have the motherboard replaced at your trusted repair shop. And while you are at it, (again as mentioned in the same post), you should also better replace the PSU to save you time and effort in the future.
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I’ve experienced this problem a few times myself and it only took a couple of self-rebooting for me to get annoyed at my PC. There are five reasons why a PC starts to self-rebooting, I’ll have to break this post into five different parts.
It’s possible that there is a problem in the connection of your PC to the electricity supply.
Plug the PC properly into the wall socket.
Plug the main leads properly into the back of the PC.
If your PC is using a multiple adapter, plug the adapter properly into the mains. If that does not work, buy a new adapter.
If the main plugs include a fuse, replace it.
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Cause number 3 is a faulty Uninterruptible Power Supply or UPS. This usually happens when the PC’s UPS has outlived its two year warranty. This happened to me years ago when I was working on my undergraduate thesis. My PC would self-reboot at the most inopportune times. The cause of my agony was a simple faulty battery. The best solution to this problem is to replace the UPS when it turns 18 months old. This will prevent having your work interrupted by a sudden reboot only to find out that you had not saved any of your data for the last hour.
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So the electrical connection is not the problem. Let’s move on to the Power Supply Unit or PSU (unless your PC utilizes a UPS instead. This will be covered in the next post). The PSU is the most common cause of self-rebooting. The best way to troubleshoot this is to replace the PSU (TIP: When replacing a motherboard, also replace the PSU). There are good quality PSU out there and they come in relatively cheap prices. Do not attempt to replace it yourself if you have no idea on how to do it. Better take your PC to a repair shop.
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