Question about Apple iMac G4 Desktop

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Imac g4 won't start but shuts down when apple logo appears on screen

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Are you sure the iMac is really shutting down or just turning off the backlight? The tell-tale sing would be to let the unit fully boot-up (wait 3 minutes) and the press the button the apple keyboard that ejects the CD-ROM. If the CD-ROM door opens, you iMac is running with disabled or broken backlight.
The inverter circuit on the iMac G4 is known to be weak.
There could be another problem, though. The iMac G4 is also known to have weak internal power supplies. Here's how you can tell:
Hold down the CMD OPT "O" and "F" keys at the same time while pressing the power button. This will tell the iMac that you want to boot into the Open Firmware shell, bypassing the Mac OS X startup. If this works, your power supply is good, the inverter is good and you have a problem with your Open Firmware boot string. To fix the boot string, Power on the unit while holding down the keys CMD-OPT-P-R to zap the parameter RAM (PRAM) and reset everything to defaults.
If you were not able to boot into the Open Firmware shell, your problem is either a failed power supply or a failed screen backlight. The last possible culprit is your iMac could suffer from "Bulging Capacitor Syndrome", where a batch of iMac G4s, iMac G5s another electronics were fitted with a bad batch of capacitors. Eventually, the caps will rupture and cause irreparable damage to the logic board. Only way to verify this is to pull the unit apart and visually inspect. If you see little green or blue cylinders that seem to be bulging or oozing a thick oily goo, that's your problem. Only recourse is to shop around on eBay and look for a replacement logic board.

Posted on May 30, 2010

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1 Answer

Will not boot to safe mode imac g4


Starting up in Safe Mode Follow these steps to start up into Safe Mode.
  1. Be sure your Mac is shut down.
  2. Press the power button.
  3. Immediately after you hear the startup sound, press and hold the Shift key. The Shift key should be pressed as soon as possible after startup, but not before the startup sound.
  4. Release the Shift key when you see the Apple logo appear on the screen.
After the Apple logo appears, it may take longer than usual to reach the login screen. This is because your computer is performing a directory check as part of Safe Mode.
To leave Safe Mode, restart your computer without pressing any keys during startup.

Sep 25, 2014 | Apple Computers & Internet

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How do i shut mac off then put start up disk in ?


Simple. Load the Apple System start-up disc first while the computer is running. You should see its icon on on the screen. Then select restart from the Apple Menu on the top left of the screen. Hold down the C key as it reboots. You will now boot into the start-up disc. This method also applies to Disc Warrior and other tools. Alternately, with the computer already running, insert the Apple System start-up disc then go to System Preferences also under the Apple menu, Under the start-up disc icon, select your apple system icon and restart.
Third alternative. With the computer running insert Apple System start-up disc. Restart the computer. Before the chime, press and hold the option key, left-hand bottom side of the keyboard to the left of the Apple (Command) key. You will see your system HD icon and the screen as well as your Apple System disc. Click on the System Disc and that will boot the machine.

Jul 09, 2014 | Apple iMac G4 Desktop

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My iMac g4 1ghz wont boot


First hold down the right hand shift key down when you start, this does some housekeeping, The next step is if you have an install disk or tiger disk then start up from it by holding the "C" key down when starting and inserting the dvd, if this loads then go through the install menu, dont worry you do not need to actualy install just select language and then you get to a screen where you can select utilities from the menu bar, then select disk utility and repair permissions, after that do a repair disk then quit disk utility and change the startup disk back to the hard drive and restart, if for some reason you cannot repair the disk, this refers to the catalogs it uses to keep track , not the data itaelf, in that case you need a 3rd party utility like Disk warrior.

Feb 24, 2010 | Apple iMac G4 Desktop

1 Answer

The container that hold my dvd disk wont come out when I press the open button on my apple computer?


It may be stuck so what you can try are one of these options:

Option# 1
* Shutdown your iMac G4
* Before you turn on your iMac, hold down your mouse button(s).
* Turn your iMac on still holding the mouse button(s) down.
* You will need to keep holding, until your disc ejects as your iMac starts up. That should do it.

Option# 2
If it does not, try using the Terminal utility to attempt to eject the disc.

* Click anywhere on the blank space of your desktop
and then you should see Finder appear near the Apple menu icon located in the upper left corner of your screen.

* Now from the Finder menu, select Go > Utilities.
* Within the Utilities folder. locate the Terminal application and launch it.
* When the screen prompt appears, type:
drutil tray eject

Option# 3
If that does not work, you can also try ejecting the cd using Open Firmware:

* Restart your Mac and hold these keys:
* Hold Command, Option, O and F keys while booting up.

* Now type: eject cd

To exit the open firmware screen type: mac-boot

One of these 3 methods should eject your disc.
------------------------------------------------------------------------
If not, you may have a genuinely stuck CD in your drive and may need to take your iMac in to your local Apple retail store Genius bar or local Apple-authorized service center to have it safely and correctly removed.

Honestly, however, I have this same type of iMacG4- you will probably have the cd out by Option # 2 :)

Regards,

-Mactechtrainer

Jan 04, 2010 | Apple iMac G4 Desktop

1 Answer

APPLE IMAC G4 - TRYING TO INSTALL OS WITHOUT DISK EJECT BUTTON


Reastart the iMac and at the same time hold down the mouse left click button. If that does not work.
  1. Restart the computer.
  2. Immediately after the startup sound, press and hold the key combination Command-Option-O-F.
    Note: The Command key has the Apple and (commandkeysymbol.gif) icons on it.
  3. Release the keys when you see a white screen that says "Welcome to Open Firmware."
  4. At the prompt, type: eject cd
  5. Press Return, then wait a few seconds. The disc drive should eject any disc that is present, and "ok" appears behind your command when the action is complete.
  6. Type: mac-boot
  7. Press Return.

Dec 11, 2009 | Apple iMac G4 Desktop

1 Answer

Falt panel imac will not boot up


Try resetting the Pmu.
  1. Shut down the computer.
  2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
  3. Turn on the computer.
  4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
  5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
  6. Release the keys.
Good luck

Sep 22, 2009 | Apple iMac G4 Desktop

1 Answer

When i stert my g4 imac,s screen was became blue


You need to reset your pram
  1. Shut down the computer.
  2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
  3. Turn on the computer.
  4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
  5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
  6. Release the keys.

Jul 01, 2009 | Apple iMac All-in-one - 3.06GHz Intel Core...

1 Answer

Imac question


Try turning it on with the shift key down. This gives a safe boot. If it's going to turn on at all, it will turn on then. Also, boot it with Disc Warrior or Tech Tools and run some tests to see what is going on. I hope you find all is well, and that the repairs are just minor. Good luck.

Sep 19, 2008 | Apple iMac G4 Desktop

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