A few weeks ago I built a PC from scratch. Everything came off without a hitch -- no problems at all. I'd added memory and drives and CPUs, but had never built one from scratch before. It wasn't that hard. And it works great, except for one thing: I'm getting intermittent crashes where I get weird diagonal lines across my screen and the whole thing locks up. This can happen anywhere from once every two weeks to a couple of times per day. I checked my CPU temp, and it's fine. I did a memory test, and that checked out okay as well. What else could be causing this, and how can I check to see what the problem is? Any ideas? Thanks for any help because the thing is virtually useless to me until I can get this corrected.