My computer won't start up (I only get a picture of a folder)

My computer won't start. When I press the power button I get a picture of a folder and with in it, a question mark and the mac face keep flashing.
It looks serious... any help with what's going on is appreciated!
Thanks!
PowerBook G4   Mac OS X (10.4.8)  

Hello Abdulrahman Almannai,
The Apple Knowledge Base article found here may help.
Be sure to follow the steps in the order given carefully.
hope that helps some,
littleshoulders [:-)

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