IBook Wont Shut Down

I have an iBook G4 and it will not power off. the screen is just black and the sleep light is on. I held down the power button, but this will not switch the laptop off. i removed the battery, and the sleep light went off, but as soon as i put the battery back in, the sleep light comes back on. if i remove the battery completely, and only use the power adapter, i get the same problem. any one seen this before or have any ideas what might be the problem? thanks!
iBook G4   Mac OS X (10.4)  

No offence taken at all! i cant get to the apple menu, the screen is just blank, it's as if the laptop wont switch on, but the sleep light is on which suggests the laptop is powered on somehow. i've let the battery waste right down, but when as soon as i plug in the power adapter, the light comes straight back on again.

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