Guys, I'm very frustrated, my iMac had a problem with the logic board and that's why the CPU fan wasn't working, at the time I thought the problem was with the CPU fan, so I threw it away and bought another one, which didn't work.
So I changed the board logic, and the cpu fan started to work, now the problem happened again, the cpu fan simply stopped working, there is no dirt, it is spinning freely but it doesn't work.
Is there any way to test the cpu fan connection so I know If the problem is in the fan or the logic board?
Please help me!!!