Hello everyone. My problem started appx 3wks ago,PC would not boot up. This turned out to be a failed HD (Hitachi 120g appx 18mnths old) Using win2k pro OS pent 4 processor. The drive had failed completely would not even spin up (Tried also on another machine) I did a clean Install of OS on my other Hd (Also Hitachi 120) When I tried to boot, the BIOS could see the drive and boot sequence would start but would stop before completing (NO warning) just stop as if unplugged from mains, would keep retrying again and again and sometimes eventually work for about 5mins then shut down again. On the advice of a friend (PC Engineer) I removed one of the memory cards, this improved things greatly but still took a few goes before booting and would still stop at random (Maybe every few minutes or may run for 10Hrs) but would still shutdown at random for no apparent reason. Today I bought and installed a new PSU, this has also made a huge improvement (ie less shutdowns) I still cant use the other memory card. Sorry to be so lengthy but i am frustrated by not being able to find the root cause of the problem, I can make the thing work but i haven`t actually solved what was wrong. ANY suggestions most appreciated I may have missed some simple point.