Hi everybody, I have been looking into this issue I am having with my iMac. I do see it's a very common problem and Apple is not acknoweledging it. I have googled for several days and have not come across one that has the exact problem as mine. So I get those glitchy horizontal lines across the screen. I have smcfancontrol installed to monitor the temperature and fan speeds and occasionally increase them (but not often.) The computer is fine, no lines or glitches until the system temperature goes over 40 - 42 C (104 - 107.6 F). Even when the fans are up it's still heated. No one has ever reported they get lines only after the system heats up. What could this problem be? Oh and also, the computer is absolutely fine in safemode (safeboot). I've just noticed that there will be no video which I read is normal because of the limitations safemode causes. So is my iMac still salvageable? I heard there might not be permenant damage done to the GPU yet. How would I go about managing and fixing this issue? Any help is much appreciated. PS - I know that it's time to upgrade, however I love this iMac and I do not want to see it go. It was my first and I'm extremely satisfied with it. I use it for reading, surfing, checking emails and occasional youtube. Most of the time I'm on the go with my laptop or iPad. Thanks again!