Hold power button until the little blue light that is beside the card reader goes out. That will get you restarting and will work itself out and go away once all updated.
Maybe swap DVD drives to install Vista (use YouCam for webcam and QuickPlay for remote control to work)Hope this helps...
This worked for me, I had black screen, continuous restarting, no bios, etc...
DV6000
Windows Vista Home Premium 32Bit
(was XP Media Center Edition)