Hello, I am going nuts with this random freezing issue. The PC just locks up and the only fix is to hold the power button for 4 seconds and kill it then reboot. I have tried several things to figure it out. So far I have upgraded my video card and power supply. (video fan was dead and power supply weak anyway). I ahve also swapped out sticks of RAM, ran AVG, Malware Bytes, CCleaner, etc. I am pretty much out of things to try. Any ideas???