I build a computer from parts recently, and have had no end of trouble with it. Initially one of the 2 1Gb DDR PC3200 has proved to be no good so I ditched it. The situation now is that I have thefollowing set-up; Mobo - ABIT FATAL1TY AN8SLI G/C - Nvidia GeForce 6600 - Gigabyte GV-NX66256DP P/S - Jeantech JNP350 350W (ATX2.0) RAM - 1Gb DDR PC3200 - not top quality RAM I must admit. H/D - SAMSUNG SP2504C (SATA 250Gb) C/D drive - LG DVDRW (can't remember the model exactly) O/S XP s/p2 CPU - Athlon64 4000+ Floppy drive Abit micro-GURU front panel device. Symptoms are that when I start hitting the system heavily (e.g. games or anything that taxes the graphics it seems), then either the system reboots or windows shuts down the executable. For example I switch on and fire up TOCA3, after 5 minutes to get a windows error message "RD3.exe has had to shut down", and it closes TOCA3. If I fire up TOCA3 immediately again the machine often just falls over reboots after a few seconds. I'm fully up to date on the drivers and BIOS as far as I know. I've attached some mini dumps which I can't interpret, if anyone can then I would be most grateful. The remaining RAM runs thorugh memtest86 (or is it memcheck86) for hours without reporting any errors.