Swapped out power supply unit and iMac still does not boot up.

A month ago I added a ssd to my IMac. So I was running the stock 1tb hd and 2nd ssd 1tb Samsung along with my optical drive. It was running fine til 2 weeks ago when it shut it self off. It would not reboot. So I ordered anew PSU and installed it last night and still not working. Any ideas?

Also the replacement one I got from ifixit did not look exactly like the orginal one. The left is orginal and right is the new one .

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Can you locate the Apple P/N on each? See if they are the same. If not do a Google like this 'Apple 345-0909' use the numbers you have in place of mine. Let us know what you discover.

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