OK couple of weeks a go I put a new hard drive - extra memory and sound card into a friends computer. His last drive `went up in smoke` and he turned it off...... hmmmm risked putting one of my drives in there and all was fine - so I said new drive... and the other bits he wanted added.... All fine for 2 weeks... then blue screen of death when he started windows... he mentioned popups etc .... hmmm got it off him.... wouldnt start in safe mode.... next thing - format drive install again... same problem .. blue screen or freeze - few seconds after the xp (pro) loading screen - bar moves then freezes.... heres what ive tried so far : took the extra memory out - tried his original and the new one - same either way in. ran DFT on the drive - full test - no errors... its a maxtor. tried to install windows 2000 - goes to a strange screen with blue lines on loading and freezes... strange. Not sure what to try next - was thinking of putting a drive of my own in there... but dont really want that killing... any suggestions ? His motherboard ? or power supply... the machine is an Emachines 960 - google dont find any such machine. as always thanks in advance... oh all Bios - fans - health etc seem otherwise ok. also - could it be some kind of virus ?? any DOS software that will check the hardware - like I said the drive seemed ok..