AMD-V enabled but not operational

[ldp]

I have an AMD Phenom X4 9850 and an M3N-HT Deluxe mainboard. For the past 7 months everything worked perfectly, but I rebooted yesterday and when I tried starting any of my virtual machines, got this error:

"VT-x/AMD-V hardware acceleration is enabled but not operational. Please ensure that you have enabled it in the BIOS of your host computer."

I've redone the settings, power cycled, reseated the RAM, restored BIOS settings to factory defaults, but nothing works.

[Frank Mehnert]

The VBox.log file of that session is missing.

[Rick Fink]

AMD Phenom X4 9850 Black Edition, GIGABYTE M57SLI-S4 board running Windows 7 x64 Ultimate. Have same error when attempting to run x64 Windows 7 VM. Windows XP Pro VM runs properly but a Windows 7 x32 VM fails with "AMD-V is being used by another hypervisor" error. Did not have this problem until I updated to 3.2.8.

[Rick Fink]

FIXED: After some more research I tried flashing the BIOS to an older release from Gigabyte. That did the trick, now AMD-V is working and I can run all four of my VM's 32 and 64 bit with no problem.

[Frank Mehnert]

Ok, so this was/is a hardware issue.