Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor

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No longer will power on

My 2011 27" iMac started restarting by itself and now will no longer power on. I tried replacing the power supply unit but did not fix the problem. Are there any other remedies?

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the Mac does not start? No sound?

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It's most likely the video card.

Mac (27-inch): AMD Radeon 6970M Video Card Replacement Program

Apple has determined that some AMD Radeon HD 6970M video cards used in 27-inch iMac computers with 3.1GHz quad-core Intel Core i5 or 3.4GHz quad-core Intel Core i7 processors may fail, causing the computer’s display to appear distorted, white or blue with vertical lines, or to turn black. iMac computers with affected video cards were sold between May 2011 and October 2012.

Apple may still be honoring this replacement program.

https://support.apple.com/en-us/HT203787

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