because I am not familiar with how to get to the innards but whenever I work on the hard drive, I unplug the AC power supply and then remove the battery. Then change the hard drive. If you did not do that, it may have been damaged. Try a bootable CD - like the XP install disk to see if it will boot to that. You may nave to repair the XP install or even replace the hard drive, if it is damaged.
You could also try a Linux Live CD to boot to and check the hard drive with diagnostics software.
i have an acer aspire 3620 which was running windows xp home,40 gig hd,256 meg ram.well to make long story short i pulled the back cover off for the ram cards to see how they are installed and also the cover for the hardrive and pulled it and installed it back as for everything else i put back like it was i pushed the power on and all i get is a blank screen the hdd indicator lights up for a few seconds then goes off and hear the cd drive do its thing and thats about it i get no picture no beeps or anything i beleive i killed it but can somebody tell me how so i can fix it or get it fixed