no cuda-capable device is detected when runnning devicequery on Wibndows 2008R2


Windows 2008R2 with two Tesla M2070-Q, running Windows 2008R2 OS.
The on-board display card is Matrox.

I’ve install latest driver 311.35 and CUDA 5 default installation.
When running the devicequery program I get “no cuda-capable device is detected”.
In the device manager, both M2070-Q cards are working OK.
I can’t access NVIDIA control panel due to the fact I do not use the NVIDIA card as the main
display adapter.

How do I fix this ?