So I built a computer from scratch about a month ago, but I've been having some problems with it randomly locking up. First, the specs: Intel Core i5-2500k 8gb RAM (G-skill ripjaws) PowerColor Radeon 6850, running HDMI audio/video out to a TV set Running the OS from an OCZ Vertex 2 SSD, have a 1tb drive for data Asus P8P67 motherboard Running Windows 7 Pro 64 bit, SP1 The issue: My computer will randomly completely lock up, looping a few milliseconds of whatever sound was playing over and over again very loudly so it almost sounds like static. The entire system locks up, whatever was happening beforehand freezes and I cannot use my keyboard or mouse. The only thing I can do is hard-reboot and just wait for the next crash. I've checked event logs and can't seem to find anything, but I guess that doesn't necessarily mean it's not in there. I had this up and running perfectly fine for a few days after building, but I'm guessing that I was just lucky and didn't experience the crashing. I've checked my RAM using memtest 86, and both sticks check out fine on all tests. I've completely removed all ATI drivers from my computer and then re-installed with no luck. I've also checked in my BIOS directly after crashes, neither the CPU or video card seem to be outside of normal operating temperatures. The crashes occur while using Windows normally...I'm typically just running firefox, itunes, skype, and utorrent. It also used to crash after 10~15 minutes of watching video, but after I switched the video card to the other PCI slot it no longer crashes during movies, only the random lockups happen now. I have a replacement video card in the mail right now to see if that's the issue, but could this possibly be a bad motherboard? Any help or insight would be greatly appreciated! Let me know if there's any other information I can provide.