This question has been around forums in one form or another but I was not able to find a definite answer. Please help - I have no idea who to ask anymore. I read that heat can cause display issues with iMacs (prior to 2012 version) and I am worried to prolonged exposure to high GPU temperatures. The problem is - I use a second monitor with my 2011 27" iMac (it is important to my work) and it causes the GPU to constantly work in 70-80C (Celsius) ranges. With the secondary display plugged out, the GPU temp is 50-60C. I would like to know if anyone had any issues with dual monitor setups after long periods of time. I don't have an Apple Store in my country and replacing parts in an authorized repair service would cost a lot of money. So, basically, if some screen issues/smudges appear as a result of heat, I'm pretty much stuck with them. So, any thoughts? I would really appreciate some advice. Is running dual monitor setups safe?