I've been having a problem with my computer recently. I myself have no clue about computer, so I guess you'll have to bear with me. My friends at school helped me put this system together, but since school is out for the summer, I can't get in good contact with them. Basically, my computer randomly shuts down. Not shuts down through windows, just plain shuts off. Now its been suggested that this is either the Power Supply or the CPU fan, but I don't know which and really have no idea of that out. I have an Antec 350w power supply on an Asus P4C800 deluxe and a Pentium 4. I am also getting an error message sometimes when I start up (sometimes after the random shutdown, sometimes not) that the "System Failed CPU test," but again I have no idea how to correct this. This isn't as bad because I just try again after that message and the computer boots up fine. Any help would be appreciated.