VRAM and Graphic card

Hello,

I'm running an old G5, it has Studio 2 on board, all works well. I use this machine to convert with compressor or any "on the side help".

Since last week i would like to run it with a remote desktop, so I took away display and keyboard.

All works fine, only, i'm now getting the famous "Vram and graphic card" error and final studio wont start.

I connected a screen, and it all works again....

How can I run the Final cut studio without a display connected?

Thanks,

Chris