Well, this is an OLD post but I figured I would just reply since I have been upgrading my old HP X4000 over the years. It seems to be holding up and I was able to upgrade it to Windows Vista (also Windows 2008) although the memory cap at 4GB sucks.
Anyway, I am running Windows Vista Business on it now, but for anyone having problems booting this sucker with Windows Vista you have to download drivers. You can probably find it on your own with Google search but just to make it easier for everyone else:
LSI53C1030
Basically LSI drivers for all flavors of OS for your old HP X4000, but my machine is running smooth with this driver...
Unfortunately, I am running the HP BIOS so does anyone know how to replace the BIOS on this thing to the TYAN version?
