Hello, I have got a Sandy Bridge MacBook Pro, 15" with a 2720QM and 6750M -- absolutely love it, perfect in every way. Only I have an external "monitor" connected to it via HDMI, a 32" Philips LCD TV that doesn't like AMD graphics cards. Every 20-30 minutes, colours turn to green and pink. A number of people have noticed this, so I am not alone. No problems with an nVidia GPU (tested with a mid 2010 13" MBP, equipped with a 320M). It's because it doesn't like the YCbCr pixel format (at least not coming from AMD GPUs). Under Windows, exact same behaviour by default. Switching to RGB 4:4:4 fixes the problem entirely. I am left with two choices: 1. Switching to RGB 4:4:4 on the external display output. I haven't found a way to do this, but from Google results, AppleTV has this settings so chances are it's present in the regular Mac OS X, only buried somewhere. Is there such a setting? 2. Bypassing the discrete AMD GPU, and use the integrated Intel GPU instead for the external display. Again, no such setting but this time, I'm almost certain that the hardware is wired so that the external display output only goes through the discrete GPU. Hopefully I'm wrong. Is it possible? Any help would be greatly appreciated. Thanks.