Powerbook won;t go past grey screen with apple logo on start up

Hi
I am getting very stressed, my powerbook g4 won;t go past the grey screen with the apple logo when switched on. I need to sort it ideally without another computer to go through but if that is necessary then I will do it. I have tried the RAM reboot but nothing, there is not even the spinning loading symbol just a grey screen - which it will stay on until I turn it off. Someone please help!!!!!!!!!!!!! Not sure of my OS as I can't turn my comp on, but I am running leopard on it

Welcome!
First, see if you can boot in Safe Mode, holding the Shift key during startup until you see a message about safe mode. Getting a desktop can take longer because Safe Mode forced some disk checking.s
...I am running leopard on it
Then you should have the install disks. They can be used to boot the computer for repair. Insert the DVD and press and hold the "c" key during startup. That will launch the installer BUT you don't want to reinstall yet. Find the install's Utilities menu and launch Disk Utility. From there you can check the hard drive and make some repairs.
I need to sort it ideally without another computer to go through but if that is necessary then I will do it
That would require that your compute work enough to start in FireWire Target Disk Mode. FWTDM lets your hard drive show up on another Mac as if it were an external drive. You can test by starting the computer and holding the "t" key until you get a blue screen with a big yellow FireWire symbol. Looks like this:
!http://t3.gstatic.com/images?q=tbn:ANd9GcT8uGcDJDrUrECaelR5ash9yA3zuGBakhxrJ9TjfjO_uoCmKQ&t=1&usg=_5RiQv2QkO7UuPLUpiige1MVxdb0=!
I believe FWTDM's code is in firmware and not on the hard drive , so may let yo uaccess the disk form another computer.

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