you forgot to post the riser connection to your GPU. or either you dont install it?
EDIT:
now I see it, Connections seems ok with risers, however for Troubleshooting, dont use the riser for the meantime and directly plug the GPU on main pci-e x16 slot. when you do this, install/plug the molex power on the board.
Thx for your replies!
..and yes, the both molex were powered when the graphic card (gc) was plugged into the pci-e slot. I tried a lot of different installations.
A friend of mine is guessing that it must be an option within the bios. everything else should be correct.
Ooh, sorry overlooked this.
I will also try another power supply today evening just to be sure that the ps isn't faulty.
the ps is brand new... but who knows... the first mainboard I have ordered was also broken.
this is a good option, and btw, have you tried other pcie slots? did you get any response from GPU like fan spins, or LED Lights on?