How to reproduce the blue screen:Occurs when rebooting after installing the Hyper-V server role in Windows Server 2008 R2, if a high-end videocard driver is used instead than the default VGA driver. Note: this is a BLUE SCREEN problem, not a performance problem.Hardware:Dell Studio 1747 laptop, i7 processors, ATI Mobility Radeon HD 4650, 8G RAMMy searches here and on the web seems to indicate that the problem occurs mostly with laptop computers. ***This is wide-spread: I have seen posts involving either Dell or HP laptops and ATI or NVIDIA video cards. What I know:(I use my ATI card as an example, but other posts mention the same problem with other videocards.)- Running high-res games on Windows 7 with the ATI driver works on the same computer.- Running Windows Server 2008 R2 (Standard or Enterprise) in high-res/dual monitors with the ATI driver works.- Running Hyper-V with the basic Windows VGA driver works.- Booting after the Hyper-V role install causes a blue screen after the progress bar, before the logon screen, when the ATI driver is also installed.- Booting in safe mode is ok (ATI driver disabled).- Booting without BIOS virtualization option is ok (Hyper-V disabled).- Turning off the display driver recovery timeout causes hang (infinite timeout) instead than the blue screen (HKLM\System\CurrentControlSet\Control\GraphicsDrivers - TdrLevel DWORD value of 0).- Using basic VGA with the ATI driver (custom boot - BCDEDIT /SET VGA ON) still causes the blue screen.- Tried other BIOS/MSCONFIG/ATI options without finding anything usefull.- Tried twice from clean OS installs, with and without networking, with and without windows updates, with and without latest drivers (chipsets/videocard) from Dell.- The error in the MEMORY.DMP file is VIDEO_TDR_FAILURE (116)I could submit the full MEMORY.DMP if you need it. I'll be glad to help fix this issue, which is driving me crazy - really did spent a lot of time on this one.