Virtual Machine failure

While I've had plenty of experience in fixing seemingly dead physical machines, the death of my Team Foundation Server Dec. CTP machine has me flummoxed. It just sits there with a blinking cursor when I start the vitual machine up. This leads me to the following potential problems:

• Beta software - can't trust it? I don't believe this is the case this time -- windows doesn't even look like it's starting up
• Bad physical machine - scratch this one, too. The hard disk is only a couple weeks old & other virtual machines work fine
• Bad virtual disk - potentially yes, but I hope not. How can I verify a bad virtual disk? Maybe I'll try booting knoppix off of the virtual machine & running scans.
• Windows Gone Wild (on the virtual machine) - potentially, but I can't even get a boot menu to show up... just the blinking cursor, and CPU usage through the roof (complete with CPU fan ramp up and screaming).

I'd like to get this back up and running so I get my beta source repository back. For now I'm working disconnected, which works exceedingly better than in previous iterations of Visual Studio.