We have HP Compaq 8000 Elite SFF Business PCs running Windows 7 Pro. When Windows 8, 8.1, or Server 2012 is added as a second OS, the machines work for a few days and then the video dies so they become unusable. The solution is to boot from a Windows 7 DVD and run Startup Repair. It says the repair failed, but it fixes the problem.
I'd sure appreciate some explanation from HP and/or Microsoft about what is going on here.
I posted a video of the problem and the very strange solution here: