To start, I'd love to post more detailed system specs, but I cant even get into the OS. I had a Dell Workstation 380 with 7, sporting an extra (NOT the one with the OS) 750GB HD that failed. I deemed the case unworthy and built what is essentially a new rig. Mobo: Gigabyte EP43 UD3L with the migrated chip from the Dell. New Ram, Case, and Power Supply. Transposed the working hard drive with the OS on it. It wont boot. I get to the point where the floating dots come in, and it freezes up. Recovery says no errors have occurred, safe mode will not boot, it gets stuck on classpnp.sys (which is usually a blue screen reserved for server stations Code: 0x0000007) and for some reason you cannot do a repair installation from the install DVD by booting from it. (You have to be IN the OS to repair your OS?! What?!) So I'm stuck. Every account I've read said people transposed their drives, did a quick error fix at the prompt and were greeted with their desktop. What is it I have done that's so drastically different? No floppy drive. Don't ask. And the mobo CD doesn't recognize 7 as an operating system to do "XFastRecovery" which I assume is a driver injection of some sort. Alright folks. How do I fix it?