My graphics card is not getting detected, please help?

Georgepaul4k

Reputable
Oct 29, 2014
16
0
4,510
My specs
Cpu - core 2 quad Q9550 2.83 Ghz
Coolermaster Hyper TX3 evo cooler
Mobo - Asus P5G41T-MLX
Memory - 4gb ddr3(2 x 2GB)
Hdd - WD Green 1TB
Psu - Antec VP450P
Monitor - Dell E1912H
Windows 8.1 pro x64

I bought a Msi GTX 750 ti OC gpu 2 months ago. It makes an irritating noise and crashes time to time when gaming. I am going to RMA it soon, but the problem is that in our area, it will take 2 weeks to get the replacement. I have my old HD 6670 gpu to use till i get my gpu replaced. I tried installing the gpu, but the monitor gets no signal and has black screen. I cannot access the bios while connected to the gpu. The gpu looks ok since it spins when the pc is turned on. The display works if it is connected to the motherboard or connected to the 750 ti. I searched a lot on the forums and put the 750 ti back on and removed the drivers and used display driver uninstaller. Then i removed the 750 ti and inserted the 6670, but still no use. I downloaded the latest amd radeon driver, but i couldn't install it because the gpu is not detected and the installation fails. The gpu was working fine 2 months ago.
One more question
Will this pc run Dota 2 fine when using the HD 6670 gpu(At what settings, framerate)?