I have a PC with Windows XP loaded. Whilst using the PC last weekend, it shut down without notice, I was in the middle of typing in Word and the machine powered down. I switched it back on, it went through the screen to access the bios, memory check etc, then asked if I wanted Windows to start in sade mode, or normally etc. Before I had chance to make a selection, the PC shut down, I did not see any error message appear. I tried again, and the same happened. Third time, I interecepted using F5, and asked it to load Windows with prompt, it got so far and switched off again. Fourth time, I went into the BIOS and before I could get beyond a selection, the machine shut down again. It appears that the PC is powering up for a certain length of time only, then shutting down. I have had problems with the fan, although this was a few months ago, and this was resolved.
I would be grateful for any advice. Thanks.