Boot up problem. Restarts after the loading bar. Gets very hot.


I have a problem with an iMac 27 inch. Computer turns on, i can see the apple logo, loading bar, starts to load and at some point the computer restarts by itself and take it from the step 1, boot chime, apple logo, loading bar. I can not get in to safe boot mode, recovery mode, can't boot from external. I noticed that the computer gets very hot in the upper right corner. I changed the power supply, no fix. I changed the logic board, still doing the same thing. I am out of options. I tried to research this problem, i didnt find to much. Maybe somebody in this comunity had this problem before. I am thinking that maybe a faulty temp sensor, but i am not sure. Thank you in advance!

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