Troubleshooting Testing for Power/ - 7
Following is the order in which you should test for power in the
system: At the 1) AC outlet 2) logic board 3) power filter cable
4) power supply board 5) power supply fuse.
Testing for power requires that you remove certain parts from
the computer. Refer to the Take-Apart chapter for instructions on
removing parts.
At the AC Outlet
First, unplug the keyboard from the computer. Then, using a
known-good power cord, power-on the system using the power
button on the front of the computer. If the system powers on, you
can assume the AC outlet is good and the problem is with the key-
board. If the system still won’t power on, try connecting to a dif-
ferent AC outlet. If the unit powers on this time, you most likely
have a problem with the AC outlet. If you still have no power, you
will need to test for power at internal points inside the iMac.
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