Removed the CMOS and when I re-booted I had to set the date and time - no problem. It didn't fix the problem with the graphics card but now had a whole batch of other problems. After about two days I now have the system stable again but when I put a video disk into my HD DVD player the whole thing just hangs. If I select explorer for that drive it hangs. The device manager reads "This device is working properly. Windows did not start a related device driver. To learn more, click the Driver tab and then click Driver Details."
No matter what I doit just doesn't update any device driver for the drive. The other CD/DVD drive works fine and yet I get the same message as above. If I try and play a dvd on the CD/DVD drive it works, I swap it over to the HD DVD drive, system hangs and the the other DVD drive won't function. The system will now not shutdown or restart! I have to do a hard shutdown.
This all went very badly wrong after removing the CMOS - never again