Monitor not seeing output from rig. Worked yesterday but now won't find input

PCGAMING4LIF3

Honorable
Jan 10, 2014
24
0
10,520
My rig,
2600K@4.3GHz
ASUS DC2 7970 OCed
AsRock Z77 Extreme 4
Samsung 840 Pro 256GB
WD Caviar Blue 500GB
Thermaltake TPG-850W

Idk why my monitor won't see my DP to DVI anymore. My setup has worked for years...help meh :(