HoserEh, it's a little complicated. First, I'm getting old and my memory isn't what it use to be. It ran fine before it started to stall and slow down (I think), so I rebooted. Then Vista said I had an error (can't remember which one), so I rebooted and Vista reinstalled itself, removing everything but the OS. I thought it was a hard drive failure, so I bought a new drive and a copy of Windows 7, figuring I'd just start off with a new drive and new OS. I installed the new drive and went to change the BIOS to boot from the DVD when it wouldn't even power up. I reinstalled the old hard drive, no change. I removed the BISO battery and reinstalled, and now it won't even power up at all.