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Re: PowerBook G4 15
REplacing the keyboard on this model requires removing the top case, disconnecting the ribbon cable from the logic board and extracting the keyboard from the top case. Make sure you remove the battery from the computer first. You will need a jeweler's phillips and a torx 6 for the top left and right torx. It will require for you to peel back the mylar and backlight cabling ( if your Aluminum has a backlight keyboard )
Before doing this thought, i would try resetting the PRAM and NVRAM.
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The problem is the ribbon connectors is loose connector on the motherboard. The fix is to remove the keyboard, disconnect the ribbon connector from the socket on the motherboard and insert a very slim piece of plastic in that connector to hold the ribbon connector tighter in the connector in the motherboard, once that's done replace to keyboard. The keyboard should work.
Check for a failing hard drive
Trying booting from the Mac OS X install disc.
insert the Mac OS X install disc.
press the start button, while holding down the "C" key on the keyboard
Once you are running from the disc. go to Disk Utilities select the hard drive
click the "repair permissions" button at the bottom.
If you get any red errors listed or it doesn't seem to finish
repairing the permissions you have a failing hard drive and it will need to be replaced.
This solution is for Mac OS X go to system preferences then to the control panel Universal Access under seeing tab there is a DISPLAY Area it is probably showing up white on black change it to black on white. Hope this helps.
Sounds like you may just have your numlock on. Just press function key plus F6 (on a macboook) and the numlock is off. If not you may have a broken keyboard. You can try to replace the keyboard yourself using an Apple Tablet Repair Guide or send it to a third party service Apple Tablet Repair.
most of the time the problem is caused by a bad or worn out membrane. This is a green looking bar that is under the keys. You can find a replacement on ebay. Whomever you buy the membrane for will be able to give you detailed instructions on how to replace it. On a toshiba laptop, it takes 5 screws to replace. If you look at the bottom of your laptop, you will see a keyboard icon and that tells you which screws need to be taken out.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
Your computer's PRAM and the NVRAM are reset to the default values. The clock settings may be reset to a default date on some models. If I could be of further assistance, let me know. If this helps or solves the issue, please rate it. Thanks, Joe
Sorry to hear you are having trouble,
Well, unfortunately, this PowerBook has the trackpad and the keyboard on the same cable connected to the motherboard. ( When you say the mouse works, you actually meant the trackpad right ? )
Cleaning does not help, we had the same problem but in reverse, the keyboard worked fine but the trackpad would not, even the click...
Apple will replace the entire top case to repair this even though it's just a little cable, that cable is really hard to replace by itself.
Sorry, it's a 200$ repair job.
How often? Can you make it happen on demand?
Acquire any other USB keyboard, and plug it into a USB port on your PowerBook. Use this keyboard for a while. If you don't see the problem, then I suspect some sort of short in your keyboard cable, or perhaps a spill in the keyboard itself.
PowerBook G4 keyboards are very easily replaced, without opening up the laptop itself.