Question about Apple (661-2795) for iMac Motherboard

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17" iMac quit working

When I took the iMac to a dealer they said it was the motherboard and it would take $1,000 to repair.  When I got home I let the computer in the garage.  Next morning I brought the computer in and plugged it in.  The computer worked, for about 10mins, until it heated and then it quit again.  Now I am wondering if it is the motherboard or something else.

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Your Imac may be one of those affected by Apples purchase of inferior capacitators from Taiwan. If you are less than 3 years from the purchase date, apple will repair the problem for you for free. Just take the unit to your nearest local Apple Genius or tech. If you are outside of the repair extension guidelines, I have provided a link here which can show you or someone more skilled how to repair the problem. Ordering a new motherboard and power supply will set you back a lot of money, however the following guide and pdf give you step by step instructions on how to ressurrect your dead imac without speding more than $100.00. I was able to repair my imac using this guide and it was worth it to save a $2k computer that was only 3 1/2 years old. Check it out:

the following information (in italics and bold)  is taken directly from:  (this site is complete with instructions, manual and the full compliment of materials available at an extremely affordable and fair price. I took a chance and repaired my own, it is not as hard as it sounds1)

The iMac G5 Repair Extension Program for Video and Power Issues applies to first generation iMac G5 computers that have video or power-related issues as a result of a specific component failure. If your iMac G5 is exhibiting any of the symptoms listed below and your computer's serial number is within the noted ranges, your computer may be eligible for repair, free of charge. If Apple or an Apple Authorized Service Provider (AASP) determines that your iMac G5 computer is eligible as part of the program, the repair will be covered by Apple for up to three years from the original date of purchase even if your iMac G5 is out of warranty.

This is a worldwide Apple program.
Affected systems will exhibit one of the following video- or power-related symptoms:
Scrambled or distorted video 
No video 
No power 
Note: If your iMac G5 is not experiencing any of these symptoms, you do not have to contact Apple or any Apple Authorized Service Provider.

Which iMac G5 computers are affected by the iMac G5 Repair Extension Program for Video and Power Issues? 
The program is available for certain first generation iMac G5 models that were sold between approximately September 2004 and June 2005 featuring 17- and 20-inch displays with 1.6GHz and 1.8GHz G5 processors.

The affected iMac G5 computers have serial numbers where the first 5 digits fall into the ranges noted below.

Serial Number ranges:
W8435xxxxxx - W8522xxxxxx 
QP435xxxxxx - QP522xxxxxx 
CK435xxxxxx - CK522xxxxxx 
YD435xxxxxx - YD522xxxxxx 
Some second generation iMac G5 computers have serial numbers that fall within the upper band of the ranges listed below. Only first generation iMac G5 computers are affected by this program.

Where do I find the serial number of my iMac G5?
The 11-digit serial number is located on a label under the foot of the iMac G5. There is a bar code underneath the serial number.
To view the label, hold the sides of the iMac and gently lay the computer face down on a soft, clean towel or cloth.

Is the iMac G5 Repair Extension program available for other Apple computers? 

This program applies only to the systems noted in this FAQ. Other versions of the iMac G5 line are not part of this program. Click here for more information on how to identify iMac G5 models

Free guide for how to repair the motherboard capacitors, rescue the hard drive and more.

Posted on May 07, 2009

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IMac crashesafter about 1 hour. iStat shows Hard drive about 47 degrees. Sometimes takes a long time to start. Hardware test shows alert 4sns/1/40000000:tp0p-131.000

Posted on Oct 29, 2009

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Hi there.
It sounds to me like the machine is overheating, this can of course damage the motherboard but in most cases its just a build up of dust inside the case or the CPU (processor) fan has failed, a can of compressed air directed at the air vents and fan can in most cases solve the problem.

Good luck and thanks for using Fixya!!!

Posted on Feb 22, 2009

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I have done this repair and so far have a 100% success rate with this fix. The last one I repaired was outside the serial number range listed above. If your interested in in having me do this repair for you send me an e-mail at

Posted on Feb 27, 2010

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Fan does not run, over-heats

Thank for contacting Fixya, I will be glad to assist you.

In such extreme situations like this, the very fact that you have taken your iMac in four times to either an Apple retail store or an Apple Authorized service provider and having those repairs/replacements performed still with no resolution, is a sign your iMac may actually need to be replaced.

From my experience as veteran Mac tech, if your computer has been repaired at least three (3) times and there is still no resolution to the issues it has been having, you should be able to get a replacement computer from Apple or one of its authorized service providers.

Given the extent of the repairs that have been performed, I would recommend you take this computer back to your local Apple store and find out what is needed to acquire a replacement iMac.

The main reason I am being so direct in this answer to you, is not only due to the number of repairs you have experienced on this computer, but also the fact that of those repairs/replacements, the iMac's main logicboard (i.e. "motherboard") was replaced, yet you are still experiencing issues with your iMac's fan not running and your is also still iMac overheating.

This is a genuine hardware issue for sure so this is the course I recommend you take. One additional point I also need to add however. I noticed you never mentioned that the Apple retail store or the Apple Authorized service provider checked, repaired or replaced the fan which stops running and causes your iMac to overheat.

That is one component you need to have checked by a Mac technician, only because if the fan is still not running, even after the main logic board has been replaced- that still constitutes the problem you are having is still relative to the hardware, not so much the software.

If you have more questions, please don't hesitate to reply back to this post.


-The MacTechTrainer

Jul 13, 2012 | Apple 20" iMac Desktop


If your problem is due to a hardware fault, the following site was very useful...

Check here -


on Jul 25, 2009 | Apple eMac G4 Desktop

1 Answer

I have an imac intel 17" which is kernel

If someone has looked at this issue and determined it to be a logic board problem then the only solution is to replace the entire logic board.

You can purchase them on here for $289:

Here are instructions on replacing the logic board yourself:

Feb 06, 2011 | Apple iMac 17" 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

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:

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,


Mar 03, 2010 | Apple iMac G5 Desktop

2 Answers


Go to the apple web site there are many write ups for screen and motherboard resets of the PMU. If not you mave have to send it in for service or find a local apple store to see if they can help.

Jan 08, 2010 | Apple iMac 17" Desktop

1 Answer

My imac 17" g5 duo core has a video problem. Half the screen is black and the other half works. I used an external lcd and it works fine.

You don't a problem with your motherboard but with your monitor. Replace the monitor and it will solve the problem.

Oct 28, 2009 | Apple (661-2795) for iMac Motherboard

1 Answer

How can I change an iMac 17' screen

Here is the guide to the 20 inch...these may work out the same, I'm not sure.

Oct 12, 2009 | Apple iMac 17" Desktop

2 Answers

Suddenly stopped working. No power.

power supply quit on you if you get nothing.

Jun 01, 2009 | Apple iMac 17" Desktop

1 Answer

Motherboard installation guide for IMAC

You may want to try:

Also there is other versions that have a slightly different layout, but essentially the procedure is the same with all G5 models.

I will C if there are better DIY Manuals.

Mar 20, 2009 | Apple (661-2795) for iMac Motherboard

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