ESXi 5.1 Black Screen when opening VM console

Hello All,

I installed a new ESXi 5.1 server and it is a member of a cluster of 2 ESXi Servers.

One is 5.0 and the new one is 5.1

When i power on a VM on the 5.0 it works fine, after it boots and i vmotion it to the 5.1 and i open the VM console it also works fine.

Now the wired thing.

If i start the vm on the 5.1 and open the vm console it will show the windows bar and the boot processes but as soon it gets to the logon screen the vm console becomes black.

if i will vmotion it to the 5.0 it will be fine, also if i vmotion it back it will be fine as well.

So only if i start the vm on 5.1 i have a problem.

Help Please.

Henry