Other symptoms: DVD-RW (Pioneer 106) will happily hang the system if there's a disk in it that it doesn't like. Prevents machine booting/shutting down if there's a disk in it (deselected in BIOS as a bootup device). Will not write to certain disks (notably CD-Rs and RWs). Put it in another system (P3/450/Intel Chipset)and it works fine with all disks. Occasional delay in accessing other drives. Have stripped machine back to fdisk/format, clean install, and still the same.Memory checks OK. All system files report present and correct. Device Manager no conflicts on IDE controllers (or anything else). Am now suspecting motherboard fault. One thing that does bother me is that the memory, whilst checking out ok, comes up with a latency of 2.5 under autodetect - do you know if this sounds right for DDR? PS - bought yet another TFT last week - sorry!!!