text: well in case u want to pull back the older hard drive from the other computer u'll have to put in the good drive into the same first ide slot and make sure that the jumper is set to make the good drive a master(the jumper is a small plug situated at the back end besides the power supply socket of the hard drive--hope u know what i'm talking abt) next u will have to boot the computer from the hard drive now here u might experience a problem if both the mother boards are not of the same model as the drivers on the new drive will be different from the ones required for the new mother board ... so press F8(or u may do without is altogether) and try to boot in safe mode if it is successful then u'll need to reinstall the new drivers for the new motherboard or else u'll need to create a boot up disk or use a bootable OS cd and reinstall windows on the new drive again.\n\nhope it helps..\n\nregards\n\nvivek\n\nbe careful with the IDE cable