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<blockquote data-quote="pigoo3" data-source="post: 1737396" data-attributes="member: 56379">I would say not quite as easy as in older desktop Mac Pro models...where there are more parts that can be upgraded (PCI expansion cards, lots of RAM, extra hard drives)...all of which can put extra demand on the power supply.In an iMac that's not very upgradeable.&nbsp; Signs I can think of that could indicate a weak or failing power supply could be:- Intermittent cold startup's (versus sleep).&nbsp; Maybe the computer needs multiple attempts to start up.&nbsp; Finally one attempt &quot;catches&quot;...and it starts up.&nbsp; Sort of similar to what happens with trying to start a car in cold weather with a weak battery.- High demand activities (especially GPU related) could over-stress a weak/old power supply...and the computer suddenly shuts off.- A whistling or whining sound coming from the computer.- Faint &quot;electrical smoke&quot; smell.- Non-normal popping sounds.In a power supply that has failed.&nbsp; Sometimes if this happens while a user is using the computer:- There can be a large POP or BANG sound.- A large amount of stinky electrical smoke (that could possibily be seen).- A short or long whistling or whining sound before the pop or bang.- Computer won't start up at all.&nbsp; No display light, no HD spin-up, no startup chime.&nbsp; Nada...stone cold dead.Some stuff I've experienced.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />- Nick</blockquote>

[QUOTE="pigoo3, post: 1737396, member: 56379"] I would say not quite as easy as in older desktop Mac Pro models...where there are more parts that can be upgraded (PCI expansion cards, lots of RAM, extra hard drives)...all of which can put extra demand on the power supply. In an iMac that's not very upgradeable. Signs I can think of that could indicate a weak or failing power supply could be: - Intermittent cold startup's (versus sleep). Maybe the computer needs multiple attempts to start up. Finally one attempt "catches"...and it starts up. Sort of similar to what happens with trying to start a car in cold weather with a weak battery. - High demand activities (especially GPU related) could over-stress a weak/old power supply...and the computer suddenly shuts off. - A whistling or whining sound coming from the computer. - Faint "electrical smoke" smell. - Non-normal popping sounds. In a power supply that has failed. Sometimes if this happens while a user is using the computer: - There can be a large POP or BANG sound. - A large amount of stinky electrical smoke (that could possibily be seen). - A short or long whistling or whining sound before the pop or bang. - Computer won't start up at all. No display light, no HD spin-up, no startup chime. Nada...stone cold dead. Some stuff I've experienced.:) - Nick [/QUOTE]

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