I recently built my first rig, and everything works great with the exception of one issue. When streaming video (ie Youtube) and playing video files, the screen sometimes cuts to black and white horizontal lines and the sound stops. This is what usually happens, but a few times the screen has turned orange, and a few times the sound just turns into a garbled mess. The only way to get out of this is to do a hard reset and hope it doesn't happen again, but I run into it once or twice daily.
It happens more often during streaming than during playback. Also, I've never experienced this problem when running any games.
Here are some specs of the build:
Windows 7 Ultimate
ASRock Z77 mobo
VGA XFX Radeon HD 7870
2x 4GB Patriot DDR3
OCZ 128GB SSD