Had a machine that we believed to have a bad hard drive. Purchase a 120 GB Western Digital Hard Drive and put it into the machine. We used the software provided with the drive to format the drive. When we tried to install Windows 2000, we get the message Error Loading OS after the install when we are trying to boot to it. We also tried using fdisk/mbr to try and take care of any possible drive errors. We also flashed the BIOS. We took this hard drive out and put it into another machine to see if hard drive was bad. On the second machine, we were able to format and install Windows 2000. Windows install was sucessful and windows worked perfectly. When we moved the hard drive back to the original machine and tried to boot, we again recieved the message "Error loading OS". Any ideas what could be wrong with this machine? Thanks for you help.