I had an application that was frozen so I did a shut down after that I got the Kernel Panic dialog box, then flashing question mark appears, the computer begins to power up...blowers, HD and spinning but nothing just the apple logo and a spinning gear clock. Not sure what the problem is and what to do...this is my first mac
Insert the system CD, restart the computer holding down the C key until it boots using the CD. Then run through the initial screens as though you are going to reload the system software until you are given a menu bar. Select Disk Utility from the menu bar when you can and then you can run disk first aid and 'Repair disk'. If this works OK then you are back up and running after a restart. Otherwise you will have to reload the system. Note: when you have booted of the CD, you should be able to access the hard disk and retrieve any files you want first to an external disk or memory stick before reinstalling the system software. Good luck - TT
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The Powerbook G4 power button functions like a reset button if you hold the power button in for a few seconds until the computer powers down.
Hold the power button in for a few seconds (until you see the screen turn off/go black and hear the fans & hard drive stop spinning).
Press the power button again to turn your computer on.
If you have more trouble, you may need to boot in Safe Mode or "perform a Safe Boot": Press and hold down the "Shift" key immediately after you hear the start-up tone. Release the "Shift" key when the gray Apple icon appears on the screen.
The sign i believe you are referring to is a Kernel Panic, if it is a gray box that dims the screen.
If this is the case, and you have your Mac OS X install dvd, try to boot off of the disc and use disk utility to repair the hard drive.
Also, check your RAM bay port to see if one of the RAM boards came dislodged and is not inserted correctly. Could also be one of your RAM boards is not compatible or one of the RAM boards is defective.
The backup battery connects directly to the logic board. From the symptoms you are describing (rather clearly, thank you), it seems apparent that your logic board may be faulty.
There are two more things you can try.
1) Reset Open Firmware: Unplug-replug your backup battery, then boot the system holding down Control-Option-O-F. Your machine will boot into Open Firmware. Type the following commands, pressing the "return" key at the end of each one:
Your machine should restart at this point. If it starts successfully, you should be done. Otherwise,
2) Reset the Power Manager. Turn the machine all the way off (no power). Simultaneously press Shift-Control-Option-power button, then release. (Do not press the fn (Function) key during this sequence.) Wait five seconds, then press the power button. If it starts successfully, you should be done. Otherwise, you will need to see a man about a logic board, which is probably not a cost-effective repair on a 1GHz G4.
Well, if you erase the wrong files, you'll sure get a kernel panic.
To power down your PowerBook when there is a kernel panic on the screen (or any frozen state) you have to hold the power button for 10-15 seconds until the Mac shuts off. Then you can restart it.
If you deleted too many of the wrong files, it may not restart to your satisfaction. :-(