Can anybody help me on this one. I have recently built a PC from the following parts : Athlon 2100+ with AMD heatsink/fan Gigabyte GA7-VAX (KT400 Chipset) Motherboard TwinMos 512Mb PC2700 2.5v 333Mhz memory stick Leadtek Nvidia Ti4200 128Mb Graphics Card Installed Windows XP Pro. Normal web browsing, word processing etc etc is fine, no problems. The problems start when I try to play a game. Soldier of Fortune 2, The Sims to name but two. It seems that as soon as the PC has to do something graphic intensive it crashes. In The Sims it simply crashes back to the desktop, SOF2 it just blue screens at the same point when I try and run the tutorial. I've tried all sorts of BIOS settings with no luck. I'm also gonna try and replace my memory. Has anyone experienced these problems themselves. If so, where do I need to start looking ? Thanks.