how can i find out where is the problem for my 4790k

Can we assume temps were normal before?

The 1st thing to suspect is pump failure. Do the diagnostics say it is working? Can you feel it working Do you have a cool line and a warm/hot water line?

Next check your radiator fans. Working and blowing air up out of the case.

No airflow obstructions?
 
May 3, 2018
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no its absolutely okay