Gray-ish Display; PC Crashes

[Inshaine]

That screen has flashed thrice now, beginning last night. I did nothing new last night except for I hooked an HDMI to my PC to see what it was like playing on my TV. After I moved the display back to the monitor it happened the first time when I clicked "tuning" on Asus GPU Tweak. It happened again while doing nothing -- was sitting on the desktop. It happened again today while playing Game Developer Tycoon. Help please! I haven't changed anything from stock settings (except I overclocked the 1333 RAM default to 1600).

Specs:

CPU: AMD FX 8120 Zambezi 8-CORE 3.1

Motherboard: ASRock 980DE3/U3S3

PSU: RAIDMAX Blackstone Series RX-700AC 700 W

GPU: ASUD Radeon HD 7770 2GB

Disc Drive: LG 24X Burner Disc-Drive

HDD: Seagate Barracuda 500 GB 7200 RPM

RAM: Team Vulcan 8GB 1600

Case: Xigmatek Asgard 381

[Inshaine]

I said "flashed". I meant it came up. It will show for 7-10 seconds, and then the computer restarts.

[xAcid9]

try downclock your VRAM even though its on stock.

[Ryan Leech]

You could try raising the gpu voltage slightly.

[Wulfgar]

Try reseating the GPU and re-installing the drivers.