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iMac vs. Electricity

flopticalcube said:
Hard to say if its not ground loop related. Try a different power outlet on another circuit. It could be a loose part. Does the humming change when you change brightness on the screen? An faulty inverter may hum on low brightness but be silent on high.
Click to expand...

mine does exactly the oposite.:confused:

i only tried to change once of power outlet, gonna keep trying
 
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