I have a new computer with top spec. (AMD Athlon 64 3500+ processor, 1024MB etc.) Since delivery a few weeks ago it has crashed at various times with an error message ' DRIVER IRQL NOT LESS OR EQUAL....... first messages stated No hard Disk Drive Detected, then BIOS not installed!
The manufacturers , Mesh, reset the BIOS over the phone and all OK for a few days. then the DRIVER IRQ mesage came up on a blue screen and all crashed. Fired up again and OK for a while. Mesh then said problem definitely memory modules conflicting (two 512's) and they would replace these plus the Hard Disk just in case. Since then and having to spend hours reloading my programs, it has crashed again and now I am informed the problem must definitely (again!) be the Motherboard and I am getting a repacement.