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Old 02-21-2016, 06:46 PM   #1
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Default Apple 24" iMac A1225 EMC2134 with a Delta ADP-240 AF B SMPS, won't start

Slight click when power button is pressed, HD spins up for 1/2 a second, then shuts down. Obviously, it is trying to power on, because the HD spins up for a 1/2 second. I don't suspect any shorted diodes or semi's. I do not have a schematic, or I could do the troubleshooting myself. Please feel free to be very technical. I have an ESR meter, and a Hakko 880 de-soldering machine.

This is a 240W power supply, and has been replaced with a newer power supply, the APPLE 661-4478, an almost identical 250W version which includes a "pressure wall" which probably has to do with airflow.

Michael Kinnaird 43+ years I.E.E.E A/V tech
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