Glad to hear the gamma and contrast effects are mostly reversible via other means (software).Not sure how to test a power issue, but I doubt it. Also was able to use the windows calibrate display settings, basically when you increase you monitor to 200Hz you're also increasing the shit out of Gamma and Contrast to the point you make your contrast absolutely abysmal.
I set the gamma via the slider in the calibration tool to the lowest, and cut my contrast down to 50 on the catalyst control center menu (remember this monitor has no OSD) and now the monitor is pretty close to displaying correctly.
However, I was mostly referring to the problem with the screen occasionally going white. I believe that's what happens when pixels are no longer being updated (they decay to white quickly). That seems to indicate to me that the panel is fine, and the problem lies in the LCD driving circuit, or some other electronics. Low/inconsistent power/voltage could be the cause. Additionally, pushing voltage higher tends to improve transistor switching speeds (at the cost of extra power and heat) and could be the extra boost necessary to consistently maintain whatever clock speeds exist internally.
I actually just ordered one of these monitors today, and should be getting it in within a week. I'll do some playing around with it then, and probably have to take it apart. I have a feeling it MIGHT be possible to fix.
The gamma/contrast issue is interesting though, and a hardware fix/explanation would be very nice. Perhaps it has something to do with built-in overdrive settings of some kind? Shorter frames would mean you'd see more overshoot and less averaging as the pixels settle. No idea if that'd be adjustable, or if that's a firmware thing.