Hello, It's my first post here, so I hope I can describe correctly my problem. I have a MacBook Pro Intel Core i7 @ 2200 MHz 4 GB - DDR3 @ 1333 MHz AMD Radeon HD 6750M, and just got an Apple Cinema Display 27" a week ago, the issue is that the first 3 days, I could play Starcraft 2 perfectly in the cinema, with the astonishing 2560-by-1440 resolution, but just 4 days ago I just start the SC2, get into a online game and it runs perfectly for the first 2 to 3 minutes. After that I start lagging terribly, until my game becomes completely unplayable, I quit the application(SC2) and in the activity monitor I have the CPU System % up to 92%, the fans running at 6200 rpm, and the computer becomes totally slow, yesterday it even shut itself (I think because it became so hot). Things to consider; -I have the MBP connected to the monitor with the lid close(the apple led cinema is the only and main monitor). -I called Apple and they told me to reset the SCM which didn't help. -The first days I could play complete SC2 games (it didn't become slow) after 2-3 minutes -If I unplug the cinema I can play SC2 perfectly on my laptop monitor(with display settings of SC2 in ultra). -After those 2-3 minutes of perfect play, the fans start running very fast. The question here is; Is it a graphic card problem? Is it something with the apple led cinema? Something I am doing wrong? Something with the temperature of the MBP? (I've tried fans and nothing) I really appreciate if someone could help me. I really don't know what else to do Greetings, regards!