15Inch G4 laptop screen black after sleep mode

I turned on the laptop and it came up with the log in mode. I realized that I didn't have the log in password so I waited for the owner to come back. 3 hours later I got the password and tried to log in again. but the screen was just black. The light in the front where you flip open the screen was on, pulsating. I tried to hold down the power button for a couple of seconds (15-10 seconds) but nothing happens. I can't start it again, I can't shut it down? am I missing something?
On the bottom of the computer I saw a row of 5 lights. 4 to 5 are on most of the time. I assume that signifies the harddrive is working...? There's also a button next to it. What is that button? Is it some sort of reset button? Should I press that one?
Any help appreciated.
thanks
Power Book G4 Mac OS X (10.4.3)

Hi S K5,
The lights your seeing on the bottom of the PB are actually on the battery. They indicate charge status. The 'button' next to it that I think you are referring to is the release catch for the battery. If you can't login and the PB is not responding when you press the power button you can try pulling the AC power adaptor then removing the battery, however I would at least inform the owner (if you haven't done so already) of this issue before proceeding further. Also, you'll need a dime or something small enough to fit in the slot on the 'button' next to the battery. Turn it in the direction of the 'open' lock icon to release the battery. Then reinsert the battery and try restarting the 'book.
Jrsy

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