I have a problem with my friend's HP-Compaq nx9010 notebook. It had winXP installed on it, with service pack 1. I had to install sp2 because of the wifi-settings. After the install, the notebook restarted, and died with BSOD.
The error was:
PAGE_FAULT_IN_NONPAGED_AREA (stop 0x00000050)
I thought it was the symantec crap, so I just deleted everything, and boot off from winXP with integrated SP2. Format, copying files, reboot, win logo appears for 2-3 sec, and BSOD again. Same error, no help about where it happens, no dump file, no remarks in the event log (checked with ERD cmmander). I tried tinyXP, win2003, same every time - except one, when it died with an ACPI.sys error, but next time it was the page_fault again.
Of course i flashed the newest bios (phoenix, F.25 from HP site), no luck.
Changed the RAM, same error. Changed hdd, same error.
Then i tried with an oooold winXP, w/o service pack, and that works....wtf.
And the bios is total crappy, no options about acpi/device settings.