I use my PPC G5 for work and don't really run anything else on it apart from ProTools LE 7.3.1. Recently PT's was crashing whilst trying to import OMF's, so I thought I'd give the system an overhaul, so I erased and installed OS X 10.4, which worked fine.
Then I tried to install ProTools LE 7 and I got an error message saying 'there were errors installing the software'. I went through this process a few times and the same thing occurred. So I bought a new hard drive and the same thing happened.

Now I am trying to install OS X again and it won't even let me do that!!

Any ideas??? Anyone...??