Hi everyone, I bought a used 2011 27" iMac outfitted with the 3.1GHz i5-2400 processor, 8GB of RAM, the 1GB HD 6970M GPU, and the standard 1TB hard drive back in December of 2016. The machine was very well taken care of and had no issues. It even came with all of the documentation, keyboard and mouse, and original packaging. It's been nothing but awesome since I first got it, even when doing more demanding tasks like video editing. However today I was doing some light school work on it (Google slides in Safari) when it froze, turned itself off, then restarted. Upon restarting it bonged and then showed the boot up screen with pink vertical lines on the display. I panicked because I knew that these machines suffered from graphics card failure, but even though it's not entirely ruled out it's pretty safe to say that it's not a graphics issue. The machine never booted up fully and always restarted, and the one time it did boot up (with no lines or anything marring the display) it was sluggish and slow, and even trying to open system profiler caused it to reboot. The machine is also very hot to the touch and smells like it's burning. To me it seems like it's too hot for normal operation and must turn itself off to save the internals from burning up. So to sum things up I want to know how do I fix the overheating and is that even what's happening? Thanks.