Built a pc two weeks back. All going well until today. Playing a memory intensive game (GTA IV) and it starts acting up. Screen starts to black out, then has a bunch of colored lines across it then the game crashes. When I could reload it (after multiple reboots), the same thing happened, or it would freeze. Then, firefox won't load, multiple programs upon reboot kick out errors saying they couldn't load, other programs have become corrupt etc. During all this, I'm getting multiple blue screen errors, some memory related (can't recall errors right now). I ran memtest and stopped it during a third pass (about 1.5 hours) and had about 300,000 errors. I haven't tested it further, i.e. pulled one stick, run memtest, if errors, pull that stick and put other back it, run memtest again etc. I will try that tomorrow. For now, do all indications lead to bad memory? I wonder why everything was fine for two weeks until tonight. Is it because the game is so intense that it fried the RAM, or did something else to it? Any suggestions?