Apple IMAC User Manual - Page 88
At the Power Supply to Power Filter Cable, General/ Testing for Power - 6
UPC - 067540444435
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Troubleshooting General/ Testing for Power - 6 At the Power Supply to Power Filter Cable First remove the bottom access cover to reach the cables feeding into the logic board/mass storage chassis. Note: You will need a volt meter to test for power at the power supply to power filter cable. Refer to the picture below to locate the necessary test point referenced in the following procedure. Unplug the power supply to power filter cable from the back side of the logic board/mass storage chassis. Plug in the iMac, but leave it powered OFF. Note: You may need to unplug the RGB video cable to access the power cable. Testing for Power at the Power Supply to Power Filter Cable Ground the black probe on the volt meter to the computer's metal chassis. Carefully touch the red probe to the first pin on the top right end of the power cable (the top being the side with the connector key on it). If you get a +5V reading, you know you have power from the power supply and that the power cable is likely OK. There still could be a problem with other pins on the cable, however.