Powerbook G4 wont turn on

ok, im a newbie to Macs and i obtained this laptop 2nd hand. i cant get it to turn on regularly. when i hit the power button, sometimes you will here the fans, sometimes the hard drive will spin up, sometimes all you get is the caps lock/num lock light, and rarely it will boot up.
i have it plugged into the wall with the adapter, the battery lights show full charge, i have reset the thingy with the button inder the keyboard...im lost now.
anyone help me????

you can do a few things that might get it working.
First try SafeBoot. With the machine off hold the shift key down. Turn on the computer and while holding the shift key, see if it boots up to a login or the desk top. If that doesn't work, you may want to try installing a new copy of the OS, of course you will need the install disks. You may be abled to repair the computer by installing a new copy of the OS. That might take care of your problem as long as it isn't hardware related.
Good luck

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