I've just been poking around in the BIOS (like you do)and found this option for 'OS select for DRAM>64':'OS2 or non OS2'. The mainboard uses Award BIOS and I run Windows 98se with 256 RAM. Could someone please explain the meaning of OS2 so I can check for correct setting? Thanks. (Currently set to non OS2) My suggestions are what I would try myself. If incorrect, I welcome corrections to my rather limited knowledge. Andy.