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Re: blank screen on imac g4 monitor
Well it is time consuming as you will have to start from the botom of the computer and work your way up.First put the lcd and neck between your legs the base on your knees.On the base i believe there are about six torq or phillips screws turn to disengage the base,there are a few cables attached to the base which you will have to remove,one ground screw as well.Once these are disengaged you can put the base aside.LOOKING in the base everything is layered you must remember how they are oriented remove them one by one.Eventually you will see the cables for the lcd and screws which secures the base of the lcd shaft to the base of the computer.Remember how they are oriented as this is crutial when replacing the base as it should fit without pinching any wires.
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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.
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 :)
Install your startup CD and restart the computer holding down the "C" if your computer starts off of it, the CD player is okay and you have a software problem, if does not start off the CD the CD/DVD needs to be replaced