help! mainboard does not recognize my GPU

[MalaCraft]

Hey guys.

 

first of all the system:

 

i5 2400, msi z77A-GD65, 8GB ddr3, corsair TX650W

 

So the problem is that this system does not recognize any graphics card. I have testet it with a gts 450, gtx 560 and a gtx 780. But I never get a video signal with any of them. Also I tried them in all of the PCIe 3 ports (the Mainboard Comes with 3). All the GPUs are working just fine in other Systems. The Intel Onboard works fine also.

 

So all the GPUs are powering up with the system, leds and fan are working, but i never get an Image. I have tried many things like other cables, ports, bios update, bios reset, etc...

 

In the bios theres just one PCI Setting for PCI gen3 and I only can set it on Auto or Disable it.

 

Now I have no idea what i can do to make it work.

Are all the PCIe Slots all of a sudden dead?

 

I really hope you can help!

 

btw: it is a clean Windows 7 install

[PowerPigeon]

Edit: Just saw your note on the onboard working fine, nevermind.

[Will Barnard]

Try booting with only one stick of RAM in.

[MalaCraft]

Try booting with only one stick of RAM in.

I have tried that too, in every single slot

[SIGSEGV]

How old is your motherboard?

[Will Barnard]

I have tried that too, in every single slot

Sounds like you need a new board then RMA?