What kind of CPU do you have? If you have a Intel CPU you could try to use the iGPU in the CPU to get video just connect your monitor to motherboard, head on over to device manager and disable the Intel Integrated graphics (dont delete it) and then turn off your computer, connect your GPU, plug your monitor to your GPU and hopefully you'll get video output.
I had to do this a couple of days ago when i tried to test an R9 390X. It worked like a charm.
Simonsen got a reaction from Mister Woof in My mobo wont detect my gpu
