Before this problem i needed to wait some time, to power button start to work.
But now it stopped working, i waited, clicked many times, tried to plug out the cable, wait 10 seconds. and nothing worked
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To find the on board diagnostic LED’s after removing the display bezel iMac Intel 20" EMC 2133 en 2210 raam aan de voorzijde vervangen
Look into the cavity near the RAM slot assembly on the right you will find the 4 LED’s often covered with a small piece of black tape. Once you’ve removed the tape, plug the system in do any of the LED’s light?
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@sobaken fist thing you want to check are the diagnostic LED's. The iMac (20-inch 2007) has four built-in diagnostic LEDs on the main logic board that can help you to troubleshoot the computer. The four LEDs are located to the right of the memory slot, under the hard drive data cable
Let us know what you find out about those LEDs and what they are showing you.
door oldturkey03