I built this computer a couple of weeks ago and have been plagued with random crashes since I powered it up. Sometimes it will go for a long time playing very graphic intensive game so I dont think it is heat related although it might still be. I ran Memtest86 on it for about 10 hours and it found no errors in the memory. I am thinking the onboard sound drivers or maybe my antivirus software (Avast) are causing the crashes. Any thoughts or comments on the hardware are welcome since input is always informative. Thanks in advance. Edit: All drivers and BIOS are updated to the latest versions possible. The reasons I'm looking at the sound and antivirus are that I have had several lockups where the sound went totally bananas when it locked and a couple of screen blackouts with lockups when I clicked on the error message I got from the antivirus when it tried to update.