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.
Source: Answers that Work
It may seem that when you first installed your Windows XP, it booted up really fast. You tend to wonder all the horrible stories you’ve read that Windows has a very slow boot up. A few years down the road, you feel it–you begin twiddling your fingers and asking yourself as to why it takes you 3 minutes to be able to do anything on your PC. What do you do?
According to the experts the best way to go about this is to find the source:
Legitimate programs usually put an icon in the SysTray, next to the clock on the Windows Taskbar. Right-clicking an icon will often let you tell the program not to load. However, Microsoft provides msconfig, a good utility for controlling how Windows starts up. To run it, click Start, select Run, type msconfig in the box and click OK. The Startup tab on the far right lists the programs being loaded, but it’s worth looking through the other tabs. Microsoft has a trouble-shooting guide to using it: search Google for Q310560.
More info here.
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.
Source: Answers that Work
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.
Source: Answers that Work
