Asus omega error hdd code d6

[Yaboyali]

I have no idea what’s going on, but I’ve had this problem for quite some time now. Basically I turn my computer on, it passes the cpu check vga check, however my screen stays black. Usually after the vga check the ASUS logo pops up on my screen and boots. However sometimes it boots in HDD code d6, and after it boots into my windows just no display. The only thing I could possibly think is causing this would be my GPU, but my gpu runs very well. This issue happens randomly and I usually have to keep booting my PC on and off to eventually get it to boot properly. The error beeps are 1 long & 3 short which for this motherboard means no VGA detected. could It perhaps be my riser cable? Or maybe it has nothing to do with the gpu? Any help is appreciated.*

[Nonny]