MacInTouch Home Page: "As a side note, when I opened up one of these computers, I found that the loud fan noise was being caused by the plastic tab (under the fan cover at the top, used to pull the midplane out of the rest of the computer) rubbing against the topmost fan blades. Simply tucking the tab up and out of the way when replacing the fan cover solved the fan noise problem. This may explain why the fan noise on other computers is inconsistent and not always. If you have a fan noise problem on your iMac G5, you may want to simply check to make sure the tab is not rubbing on the upper fan.
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