vpro AMT black screen

Hi,

I have s Dell E6630 with vpro.

I followed instructions on How to Remotely Control Your PC (Even When it Crashes) to set up AMT on my laptop.

Now I can connect to the laptop using Manageability commander tool. But when I try to take control I get a just a black screen only instance it works when I boot into the bios. but all other aspects works perfectly even the viewer with realvnc.

I'm running both machines on the same subnet without any firewall.

Please help.

Thanks in Advance..