Update your graphics driver/ turn off OpenGL/ OpenCL in the prefs.
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I'm guessing you have an ATI video card and have updated to Catalyst 13.1 (or gotten the WHQL driver through Windows Update).
Catalyst 13.1 has a problem properly running Photoshop CS6's GPU-based Adobe Color Engine. Basically if the red channel reaches 0, all color will be blacked out.
A workaround that retains most of your GPU functionality but avoids the problem is this: Change the Drawing Mode to Basic in the Advanced Photoshop GPU preferences. Restart Photoshop after making the change.
A possibly more acceptable workaround is to completely uninstall Catalyst 13.1, then seek out Catalyst 12.8, specifically, on Adobe's web site. 12.8 works quite well in Advanced mode.
I didn't thought my ATI driver would have been the problem. But downgraded my 13.1 to 12.8 and worked like a charm!
Thanks for the quick reply!