Question about Apple iMac G4 Desktop

1 Answer

Problem with Apple imac Power Supply

I hav a an iMac flat pannel, but star having problems with the power supply.

Surfing the net, I found a message mentioning you are using a PC power supply with iMac. Can you share hoy you did it?,

Best regards
Pablo Ramirez (pramirez@itesm.mx)

Posted by on

  • pramirezf Dec 11, 2008

    It is a iMac G4/800 (15 inch Flat Panel), I extend the memory to 1Gig, and HD 80GB.



    Because it's difficult to find (in mexico) the replacement, I'm trying to connect an generic ATX power Supply for a PC. But I'cant find the power supply pinout specification.



    Best regards.

  • Krabby May 11, 2010

    Which Flat Panel iMac do you have?

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 148 Answers

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

Posted on Dec 11, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Why do only the fans work on my imac a1058


Hi Joseph,

Well it's a 9 year old iMac.. it sounds to me like the power supply has failed. Nothing under $300 to fix unfortunately

Apr 14, 2013 | Apple iMac G5 Desktop

1 Answer

Apple imac g3 power problems


The power supply is probably bad and needs replaced. You will have to put a meter on the out side of the supply to know.

Oct 07, 2012 | Apple iMac G3 15" M5521 Desktop

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

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

IMac G4 17" Flat Panel 1Ghz, new PSU, boots to Gray


Sounds like possibly the motherboard has thrown in the towel.

1 thing to check is did you apply new thermal paste to the processor before putting motherboard back in?

Did you make sure all wires were seated as you pushed motherboard back in?

Apr 18, 2010 | Apple iMac G4 Desktop

1 Answer

How to replace power supply Imac duel core intel flat pannel


You need a Access card to open the Imac from the back side and then you have to open LCD and under the LCD you can see the power supply.U need special tools for that.Dont try by your own.take it to a service center

Apr 10, 2010 | Apple iMac Z0CY Desktop

2 Answers

IMac will not power on.


Power supply would be the best bet.

Mar 30, 2010 | Apple 2.16GHz iMac Intel Core 2 Duo...

2 Answers

I have an iMac 17


Thanks for contacting FixYa Support.

I have repaired numerous iMac G5 17" models for a while now and because I have, I can tell you just from the symptoms you have described, this is potentially a power supply issue.

However, the iMac G5 17" have been known to have swollen capacitors, which can also ultimately impact the power management / performance of your iMac.

If you are able to, very carefully and don't touch them, you can look on the iMac's main logic board to see if you notice any swollen capacitors. If you are not sure what a capacitor looks like, they look like mini batteries connected to the board.

Should you do this and find that the capacitors are ok, then I would recommend for sure, that you look into replacing the power supply.

For your model of iMac 17" provided it is not an Intel-based iMac, the part number you will need to source is part# 661-3627. Below, I have also provided the most inexpensive price for this iMac power supply per this link:
AppleComponents.com

You may find even lower prices for this iMac 17" power supply, if you search online further, but this is one of the better online Apple components vendors. Therefore you should be able to see and compare the prices on this website, with some of the other vendors
advertising the same Apple power supply for the iMac 17".

I hope this helps. If you have any more questions on this subject, simply reply back to this post.

Best Regards,

-Mactechtrainer

Mar 03, 2010 | Apple iMac G5 Desktop

1 Answer

Imac g4 dead


Hello, The power supply is part of the motherboard in the iMac G4, so it's hard to change it. The repair would certainly cost more than the price of your iMac. You can try to take off the small battery, and reboot it to see if it changes. To open the mac lay it down, screen on the table (on a t-shirt). Unscrew the four screws (they wont come out, so just unscrew them. Pull the screws and take off the silver plate. Then you'll have access to the inside. Good luck

Jun 12, 2009 | Apple iMac G4 Desktop

1 Answer

Imac g5 is not turning on. LED1 stays on. I tried resetting the SMU and it didn't work. LED2 flashes on and off making a chirping noise. What could this be


Hello, Sorry to hear you are having troubles,
Is this a 17” iMac G5, if it is, and I think it is, unfortunately, this iMac model was generation 1 of the all in one flat screen design and it's a bit of a Lemon... The hard Drive overheats the video card and the power supply. With time, these 2 elements burn out.
What you have sounds like the power supply. it's a $300 repair, but, it might not be a good investment for you, the new power supply won't last much more than the first one and your video chip won't last much longer....
Best put the money and put it towards a new machine.
Sorry bout that.

Apr 01, 2009 | Apple iMac G5 Desktop

Not finding what you are looking for?
Apple iMac G4 Desktop Logo

Related Topics:

1,271 people viewed this question

Ask a Question

Usually answered in minutes!

Top Apple Mac Desktops Experts

Lawrence Oravetz

Level 3 Expert

7580 Answers

Cosma Papouis
Cosma Papouis

Level 3 Expert

404 Answers

Brad Brown

Level 3 Expert

13530 Answers

Are you an Apple Mac Desktop Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...