How do I stop my computer from powering off while I'm using it, save for a flashing orange light?

At random times (one crash happened while using iTunes, another while watching a video on Winamp, another while browsing text files from the Internet) my computer just powers off, with my tower continuing to flash on orange light on the power button. What can I do?

How do I stop my computer from powering off while I'm using it, save for a flashing orange light?
The usual causes for random shutdowns are:


1)Overheating triggers auto-shutdown to protect the CPU;


2)Memory module going bad;


3)Power supply going bad.
Reply:sounds like a conflict with some software or drivers installed. maybe too much running at once, shutting down is windows way of protecting it's self.
Reply:1) Sounds like there's a software glitch somewhere.





2) Or, are you power wires moving? You may have a loose wire somewhere. Check you power cord where it's plugged into the wall and where it's plugged into your computer.





3) If you're having power outages, you may need to invest in a good back-up power supply. I think they're called UPS.