I am a newbie so I know nothing! I have a HP pavilion with a 40GB Ultra DMA hard drive. It came with Windows XP pre-installed so I have no discs and the warranty is up. Unfortunately it began shutting down and restarting itself. I tried to go back and restore to an earlier date but it did not fix it and then I got a hard drive failure imminent message. I have recently installed a new version of Quicktime and began installing SP2 update from Microsoft. Now computer does not recognize mouse or keyboard so I guess hard drive is fried. Can I just install any new hard drive? I found a new one that is 160 GB with Ultra DMA/133 retail boxed for $60 bucks but do not know if it will be compatible. What else will I need to rebuild my computer?