So I'm going to take a few wild guesses:
1. It's never been cleaned like you see at http://reviews.cnet.com/4520-11319_7-6240575-1.html
2. It might have bad caps like you see at http://www.badcaps.net/
3. The cpu heatsink fell off like you see at http://www.progbox.co.uk/wordpress/?p=103
The list goes on and on. We have dozens of reasons for your average PC to do that.
hi my pc has started failing on boot up, not always at the same spot. the fans wir up, not always sounding too steady or typical, and then sometimes it turns off before getting to windows password, sometimes after, and also sometimes after failed startup notification page (where it gives boot up options).
i have to switch it off at the plug and then start over, possibly up to 5 times before it will boot. once into windows it is fine and never crashes, seems quite stable.
how can i diagnose why it's turning off/losing power? would this have to be done in safe mode? any ideas what's going on. i have a sturdy psu although maybe it needs testing. is there anything i can do that with? especially if it holds boot up info?