Question about Apple iMac G4 Desktop

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Usb ports broken

Need logic board on g4 imac

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Whats the serial # i can look up logic board # for you

Posted on Nov 16, 2008

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I have an imac mac but my screen isnt working but the motor is coming on how can i fix that


This can be a ribbon cable, dead logic board, or dead display. This will require a trip to the "Genius Bar".

Jul 02, 2012 | Apple iMac G4 Desktop

1 Answer

No chime no fan no screen on Imac G4 17', even after reset of the PMU


Could be a problem with the logic board. If you have Applecare, take it to an Apple store and they might be able to fix it. Otherwise, it may be dead.

Mar 07, 2011 | Apple iMac G4 17 in (M8935) Mac Desktop

1 Answer

I turn on my imac and it makes the boot sound but the screen doesnt turn on what should i do?


Attach an external monitor to the port on the rear of the iMac (requires a mini-VGA to VGA adapter). If the external monitor shows image, then you have a bad inverter or LCD panel, or a disconnected display cable. If the external monitor shows no image, then it is something else, and whatever it is will probably require a logic board replacement, which is not cost-effective in a machine this old (unless you have an unusual source of used parts).

Oct 25, 2010 | Apple iMac G4 Desktop

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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.

May 30, 2010 | Apple iMac G4 Desktop

1 Answer

Unable to turn on the computer and power supply is OK because other devices are plugged into it. Tried procedure in apple manual which says to hold down power button and at same time hold down 4 buttons on...


The iMac G4 will refuse to turn on if the logic board battery is dead. Since this model Macintosh is now about eight years old, it's quite reasonable to suspect your battery is dead. Battery replacement is a relatively simple task for a certified technician, but unfortunately the battery in this model is not a user-replaceable part.

Mar 12, 2010 | Apple iMac G4 Desktop

2 Answers

Install an Airport card in a G4 Tower



There are six models of Power Mac G4 computers: AGP Graphics, PCI Graphics, Gigabit Ethernet, Digital Audio, QuickSilver, and QuickSilver 2002. You cannot install an AirPort card in the Power Mac G4 (PCI Graphics); the rest accept original version 1 Apple Airport cards. The card is simply inserted through an opening in the PCI card guide and seats itself into a socket on the logic board. Then you attach the loose antenna cable to the hole on the end of the Airport Card. You're done.

Oct 16, 2009 | Apple iMac G4 Desktop

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I have a 17 inch g4 imac with no backlight on the screen


Its either going to be a problem with the lcd or the inverter which is why your getting the very dim screen.

Apr 16, 2009 | Apple iMac G4 20" Mac Desktop

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No usb ports blown


Hi, sorry to hear you are having trouble,
Listen, these macs have the USB Chip butted right up next to the usb connectors, the connection is really solid.... I suspect it is not a connection but the chip itself that has blown.
Probably a small static electricity shock while plugging or unplugging something, sometimes it happens when cleaning, dusting...
So, everything is on the mother board.... and you can't replace just one chip.
All 3 ports are not responding ? it's definitely the USB Chip and possibly more... I assume you cannot operate the mac since no keyboard or mouse will work these machines did not have bluetooth.... :(
You could always try getting a motherboard replacement, but you're probably better off getting the whole machine used and keep yours for parts if you really love that machine...
Apple will fix it for about $600 minimum :(

Mar 26, 2009 | Apple iMac G4 Desktop

1 Answer

Problem with Apple imac Power Supply


The most common problem with imac G4/800's are failing logic-boards. This will cause the mac to not power up at all giving the impression that the PSU is broken. 
If however, you are indeed certain that the fault is with the power supply, they are available from many stores online
Power Supply for iMac G4 15" LCD (700 & 800 Mhz) 661-3184 614-0147

Dec 09, 2008 | Apple iMac G4 Desktop

1 Answer

Internet connection


The only way to replace the network card is to replace the logic board in this unit, however if you are running 10.5, you can purchase an external USB to ethernet adapter at a local Apple retailer and you can hook the computer to the network through that adapter

Sep 26, 2008 | Apple iMac G4 Desktop

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