This is gonna be ugly.
Best if you will post your location and email address where people can reach you off forum, although the corrections will be better posted here. May be able to locate help from the immediate area.
Usual problem is that the bootstrap is missing, but without emergency floppies , it will be guessing as to which version you have and what to attempt to load back on.
There are 3 possible versions, 5.0.0, 5.0.2, and 5.0.4 that could be involved.
I would reload the OS onto an empty duplicate hard drive to the point of getting a set of emergency boot disks, then put the bootstrap from the EBD onto your munged drive. Or at least get the hard drive mounted to see what additional damage has been done.
Ed Fair
Any advice I give is my best judgement based on my interpretation of the facts you supply. Help increase my knowledge by providing some feedback, good or bad, on any advice I have given.