My PS3 slim keeps freezing from startup please help!!!?

I have had my PS3 slim for a year now. And it is not working. I start up the PS3 slim and it does everything normally until like 2 minutes in the PS3, it freezes. I cannot turn it off with the button I have to unplug the A/V cord. Someone help I want to record from PVR. I have it in good ventilation so it wont overheat. And I have tried safemode and other things.