My self built computer restarts sometimes and it can become quite bothersome. It only happens when I am copying large amounts of data off a CD, peak usage of everything. It just restarts when my CD-ROM is at full bore and my CPU is running <90%. Immediatly after the restart I checked my BIOS and the the CPU temp was 56*C(a little warm but with-in range). I have a 550W PS so I highly doubt thats the problem because its an awsome amount of power and the same thing happens with my 350W PS I tried. Any solutions? If you need more info just ask.