PowerBook G4 cannot boot up and doesn't install any versions 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.
Actually we need a little more info.

When you turn it on do you get the Mac startup "bong?"

Does the screen light up? What color is it (black, gray, etc?)

Does anything appear on the screen? EG an Apple logo, flashing question mark, drive icon with a slash through it, etc...

If it is asking for a password there is a utility on the install DVD that can reset the password. You can also reset the password by (if memory serves me...) by just removing one of the DIMMs, turning it on. Turn it back off and put the DIMM back in.