Dell inspiron 560s mobo model g43t-dm1 v:a00 doesn't support GTX 650

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Hi everyone, i hope someone can help me. I have a Dell inspiron 560s Its mobo model is g43t-dm1 v :a00, the point is that I've bought an Asus video card model GTX650-DC-1GD5 and the video card doesn't Works on that mobo, I tested the video card in another pc and Works fine. I updated the mobo bios from a02 to a06 the last one found it on the website and the same issue.. NO VIDEO just the leds and fans Works.
I tested the pcie gen 2. slot with another videocard (FirePro v4800) and it Works, so I dont know what to do, thank You very much for your time and attention.

All was tested with the same psu model pixxo monster