I have an MSI 740GM-P25 motherboard and trying to install a Gigabyte GT710 1GB PCIe card.
The card fits but outputs nothing, plus the internal graphics haven't switched off (they still work).
I can't see any obvious incompatibility but perhaps there is ? Or is it a duff card ?
There appears to be no dip switches or BIOS settings to change graphics, although I may have missed something. I tried both SVGA and DVI cables.