Okay this is my problem:
Whenever my computer is booting up, or whenever I'm playing a game it restarts. But sometimes it doesn't. Sometimes I can play for say an hour and nothing happens, but at other times when the computer is booting up it will restarts or whenever I start playing a game.
The thing that makes mine unique is that whenever the restart happens I know it because I hear a "power down" sound. This sound is followed by my screen turning black or many different colors (random). Also sometimes the noise happens but I can still do some stuff on the computer for about 2-6 seconds before the actual restart or anything happens, but at other times it's instant.
I have Windows Xp, and this is a computer my friend built for me it has a 160 GB hard drive, 1 GB ram, Radeon 9800 pro, Creative Audio GS 2 (?) soundcard, 450 watt power supply, ASUS mother board, and a random cd rom drive. (No floppy drive)
I have tried reformating, instaling / unistalling drivers, and asking 100 different people none of whom really have experience so it didn't help.
Please help, any info will be very very very appreciated!