Can't get at second video card without removing fan. Had it installed professionally.

I thought I'd managed a repair reinstall, but that appears to have hung as well. Not looking good at all.
May try a complete reinstall before I go to bed. If that fails, then I'll just be lacking the main computer for the weekend.

I've now got the problem nailed down to the SISGRV device driver, which is stuck "in an infinite loop". So, at least I can hunt how to solve that problem.