Hello, I recently purchased a second hand 27" Apple LED Cinema Display, and I now started to have some issues. The first issue started today, it is some kind of buzz that comes out of the right speaker whenever I lower the brightness of the screen. I have about the opposite happening for other people whenever the brightness would be above 3/4, a buzz sound would come up. For me it's when the brightness is below 1/4. The lower the brightness, so higher the pitch of the buzz. How weird is that? The second issue is that, whenever a sound is played, some kind of white noise starts coming from I believe both speakers of the display. Even if I just adjust the volume on the keyboard (which makes a sound as well), this white noise would come up. It would last around 15-30 seconds, and then it would disappear. If headphones are connected to the Mac Pro, it doesn't happen (and it can't be heard in the headphones either). I once hooked up the Mac Pro to a Panasonic TV to test, and there was no buzz coming from the TV either. Now I just noticed that the white noise is constantly here since the buzz appeared today (when I lower the brightness). Something is failing here I believe. It could also be the graphics card I guess? Sometimes I get a very quick weird flash on the screen (black & white stripes I believe) for half a second, then they're gone. It's quite rare so it's hard to troubleshoot. Maybe it has to do with the Cinema Display as well. Or perhaps it is my graphics card (It's a Sapphire HD 7950 3 GB the Cinema Display is connected with Mini DisplayPort). Or it might just be bad drivers for this card they were never that good apparently. Perhaps someone knows more than I do All helps is appreciated Cheers!