Sorry if this shows up twice, my anti-spam measures seem to be tripping up posting to this list... "Mark R. Myers" wrote: > Do you think the 1 128MB PNY PC100 DIMM could be screwing it up? Have you overclocked the unit, or done any BIOS tweaking? If the memory settings have been set for maximum performance, and the new RAM doesn't quite tolerate them, you may have all sorts of problems. I'd suggest spending some time with the BIOS manual and setting everything to fairly conservative (slow) settings (after documenting them thoroughly) and seeing if that helps. If it does, gradually work your way up until you find a set of stable settings. Of course, popping the original 2 back might be interesting... Good luck! - Bob