[Motherboard] Gigabyte Z77X-UD5H PCIE x1 issue

Hi there forum,

I need your assistance, I had this motherboard for about 4 - 6 months now , and i was wondering what could be the problem.

Here's the issue, whenever I plug in my Xonar Sound card, (Xonar DGX 5.1) to a PCI-Ex 1 slot, my computer does not boot. It just keeps on rebooting.

Here's what attached currently to the motherboard. Gigabyte Z77X-UD5H.

2 x GTX 680 on SLI
1 x Avermedia Live Gamer HD (plugged in to the very top PCIEx1 slot)
1 x Xonar Sound Card (just bought it)

I dont think it's the PCIE slots, because whenever I move around the Avermedia card to the other PCIE x1 slot, the PC boots just fine.

I tried the Xonar on a different motherboard it works just fine.

* I cant plug the sound card on the extra PCIE x16 slot because I lose my SLI capability, I dont know why. But yeah, thats a bummer.