I have this same model laptop (Inspiron 8000) and can tell you for sure that there is no limitation by Dell as far as installing what you want on it.
What may help you is to make a set of
Diagnostic floppy disks from Dell, and boot from them (and run the diagnostics!)
If you can't find any problems that way, I would head over to the Dell website and grab the
latest BIOS for the I-8000. I have no "EZbios" anywhere on the laptop, and it works just fine. (It may be the EZbios stuff messin up the setup.)
Hopefully that's a start.
- rp