Powerbook lost power while reformatting, now it refuses to boot

I was reformatting my old powerbook, everything was going well. I was able to install the OSX and I was in the setup part of the reformatting. My batter is dead already so I'm using the power adaptor as the sole source of power. I accidentally unplugged it and now when I turn it on it refuses to go anywhere else. It would go to the blue screen with the Apple logo for a while and then the Apple logo would be replaced by the stop sign (the circle with the slash across it) and its stuck like that. I tried turning it off then restarting it with the install disc, problem persisted. I tried rebooting it while pressing at least one out of every key on my keyboard, still nothing. Anyone experience this before? what could I do?

Hi, thanks, I was able to reinstall it, but the problem still persists . . . l have reformatted it 3 times now. By that I mean i completed the setup (they ask for the name, sets up internet etc.) I then go to the desktop etc. However, after I turn it off then I turn it on again, I get the same problem, I go the screen with the apple, then the apple turns into the stop sign and its stuck like that each of the three times I reformatted it. I did a hardware test and it said that all my hardware passed.

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Powerbook lost power while reformatting, now it refuses to boot

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