I agree. The partition data could also be corrupted. Or it may be simply a corrupted or missing System Folder or multiple System Folders on the same drive. > Directory problems. Startup with TechTools Pro, DiskWarrior, etc. > and let the diagnostics run. > > >Yet another startup problem: > > > >neither OS nor any software sees the internal drive. It spins up, then comes > >the "?", and I can start only from a zip or jaz, that's it. What to do?