My G4 powerbook starts up but with a black screen. The reset button does not work. Does anyone know the keys to press on restart please ?

My G4 powerbook running OSX 10.3.9 starts up with  a black screen. The reset button is not working. Does anyone know which keys to press on restart please.?

Try holding the shift key while booting to get Safe mode if possible.
See links for more info.
http://support.apple.com/kb/ht1564
http://support.apple.com/kb/ht1455

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