I have a Compaq nx9010, running Windows XP (cannot get the service
packs to load), which will freeze and the display will go dim. So,
what I did was I disconnected the LCD and plugged an external monitor
to it. It will run OK if I do that. I have reseated the memory,
booted it with one or the other memory module and it will still freeze.
It also seems that it is misreporting the amount of RAM, no matter
where the memory is seated. It is running the latest BIOS.

Bad board?