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My iMac will not turn on

Everything else is working and have replaced fuse, but it will not turn on? It is a power mac 4.2

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Take this complete tutorial to check out Symptoms and their Resolution http://support.apple.com/kb/ts1367 and if still need some help follow Mac Support .

Posted on Aug 04, 2014

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Why won't my 2002 Imac power on?


Makes sure it's plugging into a power socket, and the socket is turned on (sorry for the obvious but you'd be surprised).

Try a different wall socket (could be a fault in the outlet).

Unplug the power cable from the back of the iMac, press and hold the power button on for 15 seconds. Plug the power cable back in and press the power button as normal to start up the iMac...

If that doesn't work, it may be that the Power Supply has failed, take it to the local Mac shop to test.

Sep 27, 2014 | Computers & Internet

1 Answer

MA878LL iMac 24" core 2 duo 2.4 do not turn on,


Checking the power supply isn't the easiest thing to do, it involves pulling apart the entire machine.
You can try resetting the SMC, unplugging all power, hold the power button for 5 seconds, replace power, then attempt to turn on.
if it still won't turn on, and assuming you didn't get AppleCare or it is expired (past 3 years) it might be worth taking in to an Authorized Apple Repair Facility and see if they will check it out for free. If it is under warranty, most definitely take it in or call 1-800-APL-CARE
If neither of those are an option, Power Supply http://www.ifixit.com/Apple-Parts/iMac-Intel-24-Inch-2-4-2-8-GHz-or-3-06-EMC-No-2211-GHz-Power-Supply/IF169-002
a tear down from iFixit for the 20" model, it is most likely very similar for your model as well http://www.ifixit.com/Guide/Repair/Installing-iMac-Intel-20-Inch-EMC-2133-and-2210-Power-Supply/1006/1
Hopefully that helps. Good Luck

Feb 23, 2011 | Apple MA878LL iMac with 24" Screen Desktop...

1 Answer

Locks frequently and restarts sometimes all by itself. Parts of the screen regularly skews in triangular shapes.


  • Verify that the power outlet you're using is good and your power cable is firmly connected to the wall outlet-if using a surge protector, be sure that it's firmly plugged into the wall outlet. Also, try temporarily plugging directly into the wall outlet to eliminate any issue with the surge protector; plug a different electronic device into the same wall socket to make sure the socket works, and also try the iMac's power cable in a different wall outlet.
  • Make sure the computer's power cable is firmly connected to the computer.
  • If any external devices are connected to your iMac, disconnect them and try to turn the computer on again. If the iMac will power up when those devices are removed, but not when they are connected, contact the manufacturer of those devices for assistance.
  • Try resetting the iMac's SMC
  • Remove and reinstall the SO-DIMM memory modules, located in the bottom of the computer.
  • Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve

    1. Shut down the computer.
    2. Unplug the computer's power cord.
    3. Press and hold the power button for 5 seconds.
    4. Release the power button.
    5. Attach the computers power cable.
    6. Press the power button to turn on the computer.

Nov 12, 2010 | Apple 2.16GHz iMac Intel Core 2 Duo...

1 Answer

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

Loud fan noise


You may need to reset the SMC. Unplug all cables from your iMac including the keyboard, mouse, power cable, DSL, everything. Wait at least 5 minutes. Now plug the power cord in making sure not to be pressing the power button at the same time. Connect all cables and press the power button and start your iMac. If you still hear the noise then take it in for service.

Sep 27, 2009 | Intel iMac 24" Core Duo, 2.16GHz Mac...

1 Answer

I locked myself out of my imac using leopard when my friend an e dell tec got in for me ithink he upgraded it to snow when in plugged it by accident and turned it back on it camer up telling me tgo restart...


1.: Find the disc that came with your iMac that says "iMac OS X Install DVD"
2.: Turn on your iMac
3.: Insert the disc into the SuperDrive
4.: Turn off your iMac
5.: Press down on the "Option" key on your keyboard, and keep it held down
6.: With your other hand, press the power button on the back of the iMac for 1-2 seconds
7.: A screen should come up with a picture of a hard drive, and a picture of a DVD
8.: Let go of the "Option" key
9.: Using your mouse, click on the arrow under the picture of a DVD
10.: Follow the on-screen instrustions, which will guide you through the process of re-installing OS X Leopard on your iMac

Sep 26, 2009 | Apple iMac 24" Desktop

1 Answer

Transferring software and files from PowerPC G3 to PowerMac G4


to mount somthing in a mac is basicly cutting it on for use.
'
For example if you instal a flash drive or an hard drive via an out side connection, The mac will mount it so you can use it.

Aug 09, 2009 | Computers & Internet

1 Answer

Disk utility won't recognize that there is a superdrive neither does system profiler there is a dvd in the imac, which i watched about 12 hours ago. usual fixes (left click restart) won't do the trick. the...


Hi,

They are a few thing to try althoguht you may have already tried them;

Pram and PMU reset -

First turn off the iMac, once turned off unplug everything from the IMac and physicallly unplug it from the wall, wait about 5 mins at this point, then just plug in the very basics (keyboard + mouse) - this is the PMU or power management unit aspect of this - the next step is a PRAM or paramiter RAM reset

To do this hold down the apple + alt + p + r key on your keyboard just after you turn on the iMac, and keep these held down, you should hear it chime as normal, now if you keep holding down the keys you shoud here it chime again, keep the keys pressed down till you have heard 4 chimes in total.

After that is done let go off the keys and the iMac should restart as normal - can you eject the disk now?

Sadly System profiler is normally very effective at picking up hardware that is installed in your Mac, The fact that it is not brining up anything would suggest that the super drive may be faulty or somehow disconnected, if you try the above and it does not work then i would suggest you call a AARC or apple authorised repair center and have the S/N: Serial number of your Mac ready - you can find your local repair center on the Apple website - for example the closes repair center to me would be Jigsaw Solutions LTD (www.jigsaw24.com) who are the UK's largest retailer of Apple abode and Quark.

I hope the above is helpful and that you do not need to contact an apple authorised repaird center!

Jul 13, 2009 | Apple iMac All-in-one - 2.66GHz Intel Core...

1 Answer

Imac g4 flat panel 1.0 gb power lamp replacement


this led indicate your mac is sleeping, don't panic

Jan 06, 2009 | Apple iMac G4 Desktop

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