My school IT guy tried helping me with an issue with my old PowerBook G4. I just got it from my friend because he had no use for it and he didn't know the password. I tried resetting the password and it wouldn't boot up and I have no idea why. The IT guy tried reinstalling every version of OS X. Every time he tried installing a new version. Starting from 10.5 to 10.2 everything failed and wouldn't work at all. There was some luck with 10.4 and it started installing but then crashed in the middle of installation about 4 times.
It could be a hardware issue, but is there anything that I could do without changing the hard drive? I tried clearing PRAM and going to Safe Mode/Verbose mode, and nothing worked.