I'm building my first mining rig and I set it up with one 7950 card to start with.
I connected my monitor to the 7950 and I could run cgminer and mine coins without any problems. So far so good.
Now I set my BIOS to use the integrated on-board graphics to run the monitor so the 7950 can be dedicated to mining.
Unfortunately, the 7950 does not work, even when I inserted a dummy plug
Running cgminer -n gives me the following info:
[2013-05-19 14:05:16] CL Platform 0 vendor: Advanced Micro Devices, Inc.
[2013-05-19 14:05:16] CL Platform 0 name: AMD Accelerated Parallel Processing
[2013-05-19 14:05:16] CL Platform 0 version: OpenCL 1.2 AMD-APP (1124.2)
[2013-05-19 14:05:16] Error -1: Getting Device IDs (num)
[2013-05-19 14:05:16] clDevicesNum returned error, no GPUs usable
[2013-05-19 14:05:16] 0 GPU devices max detected
[2013-05-19 14:05:16] USB all: found 7 devices - listing known devices
[2013-05-19 14:05:16] No known USB devices
Also GPU-Z does report there is a 7900-series card in the system but does not show any details for it.
Can anybody help me out?
I want to add a second card but I need to get this resolved first, as the second card will need a dummy plug as well and I'm afraid to run into the same problem.
I already uninstalled and re-installed the drivers, even different versions but no luck so far