Question about Apple iMac G4 Desktop

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IMac G4 Mac Desktop: imac g4 wont boot up scree's just blue?...

Imac g4 wont boot up scree's just blue?

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anabel smith

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Posted on Nov 21, 2018

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If it only boots to a blue screen, try booting up in Safe Boot mode:

http://support.apple.com/kb/ht1455

If this does not work, boot from your install DVD and use Disk Utility to repair the disk:

http://support.apple.com/kb/ht2956

If this does not resolve the issue you may need to use your isntall disc to perform an Archive and Install:

http://support.apple.com/kb/ht1710

Posted on Aug 20, 2010

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


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.
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It sounds like the system is corrupted. What I would do is to get your instal disk and boot up holding down the c key on your keyboard. Once you have booted up go to the file menu and run disk utility to verify and repair the hard drive. Then go to the instal menu and instal a fresh system remembering to preserve the users data so you do not wipe anything. Hopefully this will work.

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