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Message: <blockquote data-quote="techiesteve" data-source="post: 1460625" data-attributes="member: 98520"><p>Symptoms as described have been resolved by an electrolytic capacitor change on the power supply. From memory 4 reservoir capacitors on one end, cut the sealant carefully under a large capacitor on the mains input side and there are 2 small capacitors under it, change both. Again, from memory, they are 22uF and 47uF. Use same voltage or higher and 105 deg C high ESR types. I repaired 2 like this recently. Only undertake if you are familiar with soldering and are aware that the large HV reservoir capacitor bent over at 90 deg most likely needs discharging before handling. Apple have used power supplies by 2 different manufacturers in these iMacs, so yours may differ from what I've described.</p></blockquote><p></p>