So the 4M+ got the notirious PC Load Letter error message.

I pulled out the JetDirect card, the PostScript SIMM and the extra memory in the 4+ and was actually able to print to it.

I still need to install the HP drivers and find a way to get them on there, I am working on getting the 650 online after attempting to install an AztekMonster did not work (was hoping to be able to transfer and backup files using it).

Thanks everyone for your help.