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IMac M6498 no power

Unit will not power on

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SOURCE: need instructions to replace imac model M6498

I have a iMac that will not display anything on the LCD.

The iMac does post and make the sound.

Any idea's anyone.

Posted on Nov 24, 2009


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My imac m6498 will not power up or turn on at all and it is plugged in what could be wrong?

Could be a bad power supply, could be a bad power button, could be a bad logic board.

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A normal PC power cord fits your iMac. The kind of three connectors to the wall and three connectors to the iMac.

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Normalmente el simbolo que mensionas sale caundo el sistema no purde encontrar el disco duro. Pera verificar si es el disco duro que esta fallando o no, completamente apages la computadora. Oprime el boton de poder e imediatamente oprime el boton "Option" y mantenga la tecla selecionada. Esto le senala al sistema que quieres ver todas las seleciones para butiar. El sistema debe mostrar un imagen del disco duro si no esta fallado. Si lo ensena, puedes selecionar el disco duro con el mouse o usando las teclas de direciony oprimes el buton "Return" or "Enter".
Si ningun imagen aparece o mas importante, si no muestra el imagen del disco duro, eso indica que el disco duro ha fallado y necesesitara re-emplaso. El sistem de OS X necesitara ser re-instalado con todos sus aplicaciones tambien.

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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.
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.

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The illistrated guide to installing ram in your IMAC is located here:
Good luck!
Thank you,

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Power supplies are notorious on these for going bad. Goto the apple website and see if reseting the PMU will restore the unit if not try a local apple store for help.

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In order for you to make this MAC working is to reinstall the operating system to this unit and you need a installation for it in order for you to proceed with that, if you dont have it you can go get one of those CD from any computer or electronic store near you..........

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I have a iMac that will not display anything on the LCD.

The iMac does post and make the sound.

Any idea's anyone.

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