Question about Apple iMac G4 Desktop

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My iMac G4 turns on and goes to the grey startup screen with the apple and loading circle, but stays there, and gets stuck, and after a few minutes shuts off on it's own.

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RESET THE PRAM!
Hold down the command-option-p-r keys, and turn on the computer. Keep holding down these keys until you hear the "bong" four times. Do NOT LET UP ON THE KEYS until you hear the bong four times. Then let go.
If it still does not boot up, try booting up with the shift key held down. This causes the mac to boot into safe mode. You have to hold down the shift key until you see something like "safeboot" on the startup screen (not the grey screen, but the next one.)
There could also be a hard drive directory issue. While reinstalling the OS can help this, you should try DiskWarrior first. That program has saved my backside many times. It can repair the directory without wiping out all the contents of the hard drive.
There could also be a logic board problem. That gets a little tricky to fix on your own with this box. The home repair trick on that is to unplug the computer, disconnect the power supply cable from the logic board, and remove the battery. Let the computer sit like that overnight, re-assemble it, and start it back up.

Posted on Jul 22, 2009

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You may have to reinstall you OS e.g. tiger, leopard with the disks that came with your computer. that should solve your problem  

Posted on Jul 19, 2009

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Considering you have tried the Safe Boot mode to correct this, try to resolve this from the hardware side:

Procedure #1:

Here are some steps you can try to resolve the issue:

• First, hold in your power button for approximately 10 seconds to do a hard shutdown, if you have not already turned your Mac off.

• Once your Mac is shutdown, you will need to perform what is called a PRAM reset (Parameter RAM)

• Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously .

• Turn on the computer.
• Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.

• Now, hold the keys down until the computer restarts and you hear the star tup sound for the third time.

• Release the keys and allow the Macbook to start up.
If the iMac still does not start up to your Desktop correctly, go on to the next procedure:
----------------------------------------------------------------------
Procedure # 2

-PMU RESET-

The Power Manager is an integrated circuit (computer chip) that is usually on the logic board of your Mac computer.

It is responsible for power management of the computer. It controls backlighting, hard disk spin down, sleep and wake, some charging aspects, trackpad control, and some input/output as it relates to the computer sleeping.

• If the computer is on, turn it off.
• Disconnect all the connections going into the Mac except for the Power cord.
• Once all connections have been disconnected, remove the power cord from the iMac.
• Wait 1 minute.
• Reconnect the keyboard, mouse and power cord back into the computer.
• Press the Power button to restart the iMac computer.

• Observe if it starts up to the main desktop this time.
If it does not however, you may have an issue with your current Mac OS X directory or the issue could be hardware related.
-----------------------------------------------------------------------
Here is a comprehensive reference for you regarding Additional Troubleshooting for Blue, Gray screen issues and more, that you can also review:
Apple Support Link:
Startup Issues for Macs
----------------------------------------------------------------------
If all else fails, you may need to visit your local Apple retail store Genius bar or local Apple-authorized service center in order to have your iMac at least diagnosed to find out what the core issue is.

Regards,

-Mactechtrainer


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  6. Type: mac-boot
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