
In my many years of IT and Help Desk work, and being the resident geek for everyone, I have had many a relative or friend ask me what to do about a Windows-based computer (not sure if Macs do the same thing) that turns on and acts just fine and then inexplicably shuts off minutes later, for no apparent reason. It is a common problem for many PC desktop users, incredibly aggravating, and more common than you might think.
The problem is that this seems so sinister. You saunter over to your desk, flip on your PC, and everything looks peachy when it starts up. Then a few minutes later, in the middle of watching yet another YouTube video on who knows what, you PC decides to take the law into it's own hands and shut-down with no notice, no warning, and you don't have a choice.
Why, for the love of
Steve Ballmer, why? Well, since I have had a long history with many a PC, let me explain the scenario I have seen most often. When the PC shuts down abruptly like that, it is doing it for your own good. No, seriously, please believe me, put down the sledge-hammer, don't even think about doing your own DIY PC demolition just yet.
The PC has a built-in safety mechanism that turns off the PC if the power-supply gets overheated. The power-supply is that big portion of the PC case that generates and coverts voltages for you and has the power cord plugged into it. You'll notice that in general, the PC will have a giant fan on the backside of your system right near the power cord socket. This is power-supply fan. When this fan stops working, the power supply overheats and shuts your computer down. Here is what to do about it.