Have you tried connecting to your GPU and mobo output separately? Is the monitor working well (i.e. have you tested it previously)? Are all the connections fitted well? Are you using both VGA + DVI together? or perhaps VGA + DVI + HDMI? - try putting it only on one output.
It's possible the BIOS has set the monitor to output the signal from one or the other and has to be changed... Post back with the results of plugging into the other ports.
If that doesn't work...
Try removing one stick of RAM (if you have more than one) OR try changing the slot (if you are only using 1 stick of RAM)
Do you hear any beeps coming from your mobo?
Okay, I'm officially dumb I guess. It was the CPU power connector. All I saw was an 8 pin and I just had 4 pins on my PSU (600W). Plugged the 4-pin in and I'm good to go. Sorry for sounding the alarms. Thanks! :-)