I have difficulty turning it on initially. Sometimes removing the battery helps. Once on it often turns itself off instead of sleeping, even when the power cord is connected. Occasionally it gets very hot in the area of the on/off switch. Could this be a battery problem? I've never replaced it in 4 years.
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You may need to open it up again and remove first the airport card and turn it back on and if that boot your computer there's a possibility that your airport is causing the problem and the airport may be loose and touching some other parts on it.
Just remove ur CMOS battery and harddisk connection from motherboard. And then try to restart it will give u a msg no boot device or OS found.. Now reboot and add the CMOS battery and harddisk on motherboard...
1. Let it spin for a while and see if it eventually gets to the desktop. Sometimes this will work. 2. Insert your Mac OS install disk, restart your computer (if you need to force it to quit first, push and hold the power button until it shuts off). Then when you restart, as soon as you hear the famous mac chime, press and hold the C key until the Mac OS disk starts to load the system on the disk. Once it reaches the install window, don't launch the install, but go to the top menu bar and locate the Disk Utilities App and launch it. Run a Verify, Repair and also a Repair Permissions. Once done, shut down and restart without holding the C key. You should be good to go. These powerbook 15" models are awesome... keep it hummin!
Common fix for this problem is a simple Power Management Unit (PMU) reset. This will basically re-sync the battery "brain" to the computer so they when when to charge and when to stop. To do this, simply turn your computer off, remove battery and power cord and hold the power button down for 7-15 seconds. Then you MUST wait 15 seconds after pressing the button before applying power or inserting battery. 75% chance this will fix your problem. If Not, Replace Adapter/Charger. They have a microchip in them that can go bad that senses when to send more current to charge battery. Apple motherboards are generally better built so I'm not suspecting that at this moment. Let me know what you find out.
your lcd probably just went out or the connecting cable just came loose(its in behind the lcd under the apple logo that lights up when you turn it on) if you open and close it frequently it will cause this
I had a similar problem with my 15" 1.33GHz powerbook G4. My problem was I couldn't connect to a network right away or at all, or wouldn't properly reconize the card (didn't drop it).
I solved it by removing the airport card from my PowerBook and putting it back into my G4. it should be in the same location. it's underneath the battery pack. 1. power off your G4 2. remove battery pack 3. there is a latch on the right side (if the charger port is facing down), open it 4. pull back plastic cover tab and gently remove the antenna plug from the airport. 5. pull the plastic tab, until the airport card is removed, keep out for 30+ seconds to ensure it erases any corrupt log file on card it's self. 6 place airport card into the slot again, fully inserting it, it should go 1/8" - 1/4" into your powerbook 7. plug in the antenna plug back into your G4's airport(it should click 2x(very lightly)), flip plastic tab back over top the antenna cord, close you latch. 8. place battery back into your G4 9. plug computer in, turn on and it should work if not then there is something wrong with the airport card reader, which i don't think it's the case here..