hi~! I have a major problem with my pc, here is the history: I bought it few months ago, everything was okay I then installed a new more effective cpu cooler, it worked afterwards flawlessly for some months few days ago, it suddently freezed and after I restarting it, it freezed at WinXP logon screen (where the green progress bar moves), even if I removed all the usb deviced then, I chose to restart in 'safe mode' and I got the (popular - judging from the reports on the web) freezing at the mup.sys after some unsuccesful restarts, the pc ended not being able to logon to BIOS (the BIOS screen did not appear) then, I took the pc to the service but they told me that there was nothing wrong! (it was booting okay, with my own hard drive) then I took it back home, I connected everything as previously (usb, my drive, etc) and it worked excellent but after few days it did the same freezes! and now I cant logon to BIOS I cleared CMOS (by removing battery), and I managed to get to the CMOS recovery screen, I chose default CMOS settings, but again the PC freezed after I connected my hard disk or my dvd drive I can't see what is wrong! any idea? now and I am writing from a net cafe, so please advise asap, thanks!!