The problem is that my pc reboots randomly (automatic restart disabled) without any error event in the event viewer. After the first reboot the computer reboots continuously (over 10 times) several seconds after the black screen with the blue moving bar appears. If I turn the computer off and turn it on again after a couple of minutes, it starts normally. I have recently had to change the power supply (300 W) because the previous one (215 W) died. The problem with the random reboots started after the installation of the big hard drive (3 months ago). I had a similar problem a few days ago www.xp-erience.org/forum/showthread.php?s=&threadid=18121 Thanx in advance.