Powerbook G4 12" won't start up after fan running all night

I woke this morning to hear the fan running very fast and loud. The display was opened, so I quickly shut off the computer by holding down power button and then closed the display. After waiting a couple of hours, I turned on the power button and a faint blue desktop light appeared with a small folder icon containing a blinking question mark alternating with the apple faces icon. It doesn't go away. The battery is fully charged.
Please help! Thanks!

faint blue desktop light appeared with a small folder icon containing a blinking question mark alternating with the apple faces icon. It doesn't go away. The battery is fully charged.
That means that your system can't find anything to boot from. If you have your original OS X disks, put in the one that says 'AHT Version x.x' on the gray label in small print, and reboot holding the option key down. Choose the Apple hardware test, and when prompted choose the extended test. Does that tell you anything?
Another task is to reboot with the first system OS X disk in, and reboot holding the 'C' key, to boot from DVD. On the menu bar, choose Disk Utility, and first aid and repair the hard drive. Does this complete or give you any error messages?
Reset your PRAM:
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.
If there are any Apple hardware test messages, please post back what they are.
If you are unable to use Disk Utility, or get an error message on not completing the task due to failure ... , your hard drive may be toast.

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