I have a HP 8180 and have upgraded the memory; but now the computer is unable to start in safe mode. It produces an inexplicable message (to me) stating: "Himem.sys has detected unreliable XMS memory at address ********** (which changes). XMS driver not installed." I have a related difficulty (perhaps) with my monitor blanking out in mid program (any program or app.) When the monitor blanks out it produces a message: "Are pc settings correct ?" Can anybody explain why this is happening ? thanks. Matt Moriarty PCBUILD: http://nospin.com or [log in to unmask]