27” 2012 iMac not power up - dead

Thanks for the advice. Will keep in mind.

Thanks.

I did some further investigation as I have another iMac. Used the working iMac’s power cable on the poorly iMac and no joy. Used the poorly iMac’s cable on the healthy iMac and not joy. Also checked the fuse on the poorly iMac cable / socket and it had blown so perhaps pointing toward a power source problem on the iMac.

@y4ojv4wm5omavi - Yes, the internal power system is what I expect has failed. It sounds like the socket and/or cord has a short as well. Which explains the outlet fuse burning.

To test the bad cord use a Ohm or continuity meter to measure across the outlet pins with the cord unplugged fully.

There should be no connection across the plug pins 🔌 you may want to inspect the systems socket for burn marks as well as check the cords connection end to end from each line within the cord.

Oh wow! Never heard of them before, only a train ride away from Liverpool so I might give them a look 👀

Hi. Problem solved, https://computerclinik.co.uk from Lincoln were excellent in diagnoses and fix. Turns out after years of use the dust in the back had accumulated to such an extent the power source ultimately overheated. Replacement of this and everything is back as it was.

Thanks to all for suggestions.