Hello, just an hour ago I've encountered this problem. I tried to wake my computer from sleep and the display would not respond. Afterwards I manually restarted my computer and got 5 short beeps and no post. My monitor doesn't seem to detect anything at all upon turning the computer on. I built this computer maybe 2 months ago and it has been running just fine until today. Any help would be appreciated.
My build: MOBO: ASRock P67 Pro3 CPU: i5 2500k GPU: HIS HD 7850 IceQ X RAM: G.SKILL 4GB Ripjaw x2 PSU: 630W Raidmax RX-630SS
More aboutasrock pro3 short beeps post
I just tried re-seating both the GPU and memory but still no luck..
Do you have that on your HDMI port only, like in this thread: