I'm wondering if anyone knows what could be causing a brand new PC that i built for someone to lock up. I have tested the memory and every other possibility i can think of. The screen will lock up and most of the time thin, vertical, red lines will appear on the screen and thats it. The only thing odd is that 90% of the times this happens it usually doing something graphical.....for example a game. So my last option i'm shooting for is that its just the graphics card. Anyone know how i could determine if this is the case? Such as finding a log file of where the error is coming from. Anyone ever have a similar lock up situation? I just was hoping to know without replacing the G Card. Thanks for any comments!