![]() ![]() ![]() In the iMac the fan is not optimally placed to force out the hot air. In the red desktop graphic card shown for comparison, you’ll notice the fan sits atop the GPU chipset and pushes the hot air directly out the opposite end of the card through large vents on top of the input ports. The fan’s job is to force the hot air out of the computer and away from the graphics card. The fan is situated far away from the cooling fins and is mostly obstructed by the optical drive. You’ll notice in the photo below that the fan sits down and to the right of the graphics card. The copper pipes then transfer heat to the silver cooling fins and out the backside of the iMac through a horizontal cut near the top. ![]() In the iMac heat is transferred from the graphics card chipset via copper pipes. Early symptoms are an iMac that fails to wake up from sleep or one that wakes up but only shows a black screen. Due to internal space constraints, many iMacs develop an overheating graphics card issue that results in a black/blue/grey screen while the computer is powered on or a screen that shows vertical stripes or columns. There is a common flaw in the all-in-one iMac design. ![]()
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