I'm assuming this is connected via HDMI? I've had issues using older cables. It's a longshot, but a cheap easy way to diagnose the problem: Try a different HDMI cable, preferably a different brand/manufacturer. Everything HDMI tends to be finicky.
Intel i5-3570K@4.2/ Asus P8Z77-V
Samsung 1.35V 1600mhz DDR3 2x4GB at 1866 / Crucial 240GB Boot drive
WD Green EZRX 3TB media drive / CM Hyper212+ AS5
HIS iSilence fanless 7750 13.6 / SeaSonic Fanless 460Watt Gold
Fractal Designs Arc Midi / LG BluRay burner / Win7 Home 64bit