Late 2012 (27") (i5) iMac - Keeps shutting down!

Late 2012 (27") (i5) iMac - Keeps shutting down!

For the past three weeks I have experience my iMac shutting down for no apparent reasons.

Firstly I though it was simply a blown fuse which I replaced.

The problem has become more occurrent over the past week.

I even down graded to Mountain Lion to see if maybe it was the OS or software related, but the same thing happened.

I've since reinstalled El Capitan from a clean install, and still the problem persists.

I have removed the cable from behind the screen to reset the SMC (Which only helps temporary, but eventually knocks off again)

I have tried a clean install of the OS

I have switched around the Ram sicks

I have reset the PRAM

there are time were the computer will stay on longer and times when it will only boot as far as the login screen then shut down.

Please could someone help me shed some light on this very frustrating issue....... And the thing is, this computer has been very rarely used since purchase.

Cheers!

Firebrand

iMac, OS X El Capitan (10.11.5), Late 2012 27" i5

Posted on Jul 13, 2016 3:07 PM