did you build this comp yourself and is this your setup?
hard drive 1 windows
hard drive 2 <- drive in question
hard drive 3 <- new drive
or
hard drive 1 windows <- drive in question
hard drive 2 <-new drive
1. start by making sure ALL cables are plugged in all the way
2. have you tried doing a deep scan to see if maybe it's just a bad sector? <- i'd trash that HD anyway
3. more than one component having intermitant problems sounds like a psu, but they are the same component type so that raises other questions
4. if you reach the point of tear down, flex the mb upsidedown under a bright light to see if it's cracked. usually a cracked/bad mb causes restarts, though, in my experience.
