Cisco has released an update for their UCS (blade servers) software (Cisco UCS Software, Release 2.0) that contains a fix for servers that will run Hyper-V. The text reads:
After enabling Hyper-V in Windows 2008 R2 SP1 then rebooting, the server no longer shows a black KVM screen and a failure of windows startup and login.
I have not seen Cisco UCS in person (it’s been a HP ProLiants rack/blade history for me), but I know a services company that swears by these servers. Interestingly, there is even a hardware monitoring management pack for OpsMgr for UCS that you can download from Cisco if you have a support contract.