Freezing, no signal from monitor or beeps after

Hi, so, my problem is, pc randomly freeze (can be while playing or just while im browsing), and video goes off and the only way to shut it down is by turning off the PSU, when I try to turn it on, all fans work except for the cpu fan, and I get no signal, beeps or anything and again I can only turn it off with the PSU switch, it eventualy turns on as it should but I dont think its good enough to be using it like that, have tried with the mobo inside and outside the case, tried taking out 1 of the video cards.
PSU is a corsair 650w have it connected to a surge protector and mobo also has surge protector. thanks in advance
 
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