Screen black after sleep startup and won't turn off w/ power button?

I have a Powerbook G4 and hardly ever turn it off, till lately.
My computer started turning itself off after I would open it and wake it up from sleep mode. It would flash the screen quickly and then go black. All efforts to turn it off with the power button failed. I had to remove the battery and disconnect the power cord for about 2 minutes until it eventually shut down. I have not had this issue since I have been turning it off after every use, but was wondering if this was a sign that something was going out on my computer?
Thanks!

Try a system reset. It cures many ills and it's quick, easy and harmless...
Hold down the on/off switch and the Home button simultaneously until the screen blacks out or you see the Apple logo. Ignore the "Slide to power off" text if it appears. You will not lose any apps, data, music, movies, settings, etc.
If the Reset doesn't work, try a Restore. Note that it's nowhere near as quick as a Reset. From iTunes, select the iPad/iPod and then select the Summary tab. Follow directions for Restore and be sure to say "yes" to the backup. You will be warned that all data (apps, music, movies, etc.) will be erased but, as the Restore finishes, you will be asked if you wish the contents of the backup to be copied to the iPad/iPod.
There's more to try but let's go a bit at a time.

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Select your preferred language.
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Hold the power button down for 10+ seconds. Then bring the MBP to an Apple store for an evaluation.
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Boy that is way too bad.
Could you tell us what the error message was?
While sometimes the error messages are not very informative, other times they are. That might be a clue as to what is going on.
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HTH

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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?
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thanks
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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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Try:
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- Also try DFU mode after try recovery mode
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
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MBP went off and won't turn on again. Charger shows full battery ( green indicator) although I know I was close to low batt befor going off. What happened???

Thank you for your detailed troubleshooting attempts. Very helpful. Sorry, I cannot read "logs." My eyes just glass over on those things. Hopefully, a knowledgeable user will come along shortly to decipher for you.
I noticed from the pics that your location setting is "untitled." Have you tried the "Automatic" setting? Run the diagnostic test? Results?
Try the basics first:
Change your router channel number. Most times this works & is all you have to do.
Disconnect & reconnect your modem. unplug it for about 10 seconds. Plug it back in. Do the same for Apple’s routers. Wait for everything to reboot.
System Preferences>Network
Click the Assist Me button.
In the next window that pops up, click the Diagnostic button & do the necessary.
Research Knowledge Base for network problems that pertain to the OS that is currently installed on your computer. See these basic networking KB Articles: http://support.apple.com/kb/HT1401 AirPort troubleshooting guide
http://support.apple.com/kb/HT4628 Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT2712 Using network locations in Mac OS X
Manually provided DNS server addresses are higher priority than DHCP's
http://support.apple.com/kb/HT1714 Solutions for connecting to the Internet, setting up a small network, and troubleshooting
============================
What to do when you can't connect to the Internet
Also, run the Airport Utility app which is located inside the Utilities folder.
=====================
If using a Linksys router, contact LinkSys Customer Support and/or post in their forums.
If using Apple's Airport, please re-post over in one of the AirPort Forums.

Screen black after sleep startup and won't turn off w/ power button?

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