Loss of video display
During hard boot, video has horizontal noise lines and then goes black. Could the Inverter card be involved?
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Take the back cover off the machine and examine the 24 cans (capacitors) for swelling and/or corrosion. This does not sound like an inverter issue.
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Sure enough, 6 of the cans are swollen and corroded. I have since learned that this iMac suffered a power surge from a nearby lightning strike in the neighborhood.
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Sure enough, 3 of the cans are swollen and corroded. I have since learned from the user that this iMac suffered a power surge from a near-by lightning hit in her neighborhood.
by Robert