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The Mac Pro First Generation is an Intel Xeon-based workstation computer manufactured by Apple Inc. The first generation model includes the machines from 2006 through 2008.

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Is there a way to fix a faulty Mac Pro (early 2008)PSU?

I've seen guides for replacing it, but it's an expensive PSU specially if you're not in the US (my case). I've read that most PSU problems are a capacitor or something silly that could be easily replaced without having to spend hundreds of dollars.

Is it possible to repair the PSU I already have? Any ideas?


Thanks everybody for your replies. I do not understand much of PSU, and was wondering if it was a matter of simply replacing specific parts, like the ones that are usually faulty, I thought that kind of knowledge would be good to have documented out there.

But given the fact that it might be extremely dangerous, or excessively complicated, I now understand the reason the information is unavailable, and conform to the fact that I will have to replace it via Apple.

On a tangent matter,the problem seems to me, that this sort of information is really not available even to certain technicians. I took the computer to an Apple Authorized Center and they told to replace the logic board. I still have the same problem and it really seems to be the PSU, but I can't pinpoint the diagnostic.

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Renan de Araujo, yes it is possible to repair those. can anybody do that? Yes, with the proper knowledge, tools and practice. You have not yet told us what symptoms your computer has. Also, try to post an image of your PSU with your original question. Follow this guide Adding images to a new question to add the images. If you can, give us the number that is on your PSU, that might help to get some more information.


I have the same problem. My Mac Pro (early 2008) doesn't switch on or, after many tries, it start (fans working) but on monitor I can't see anything.

In really few times it started but once the system start, I can see the grey monitor with apple and then it switch off.

I read that it can really be the PSU unit and, as Renan de Araujo wrote, it cost lot of money to buy new one.

Is the repair possible to be done buy who is not a technician?

Thank you very much.


Same problem here. Mid 2010. I believe it was the PSU Relay switch. Or.. One of the processors is faulty. new PSU is pricey and repairing PSU too risky.

Not much we can do with this $5000 Mac Pro huh? I just wondering.. for the price i've paid for this Mac, did they put cheap components in the PSU? since it's just technically customized ATX model made in China (mine is ACBell Polytech, others made by Delta)


I wouldn't say there's anything cheap in here, quite the contrary: it's overbuilt. But that's not a guarantee against failure. Also, it's not excessively dangerous or complicated to service for adults used to working on electronic equipment. I bought a used Delta PSU for about a hundred bucks and it's back in service. Worth it, since this pricey thing still keeps up with modern Macs.


how do i start the dps-980bba power supply without being connected to the Mac Pro?


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Replacing components on logic boards is not a DIY project. Check out the tags on the right and you'll see you need special tools, and lots and lots of practice to do this sort of work. You say you are outside the US. A good electronics/computer repair shop could possibly provide this service.

If this Answer is helpful please remember to return and mark it Accepted.

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I don't mean to fix the logic board, just the power supply.

Maybe a guide that would tell you what are the most common parts that need to be replaced, like what people do with the Time Capsule.

I've searched for a way on Google, there are no websites telling how to diagnose or fix the power supply, it always envolves paying US$ 300 for a replacement part. I was hoping to find a way not to spend that amount of money.

There are no repair shops that fix mac power supplies around where I live, there are some which repair PCs supplies.

I just thought that maybe people around here would have a pointer on what to do.


I think machead was implying repairing the PSU was a bit much for most people.


While I sympathize in not having many options. Mac Pro PSU's are not a common item as such they tend to be more expensive than they should be. As to making a guide, thats a great idea! It's people like you who create them, so others don't struggle. Here's one suppler who has a cheaper unit: P/N 614-0409. Once you get a working replacement see if you can reverse engineer the working one and compare it to yours to isolate out what is bad. If you can, get the needed component/s to fix yours and maybe you can return the part for a refund. - Good Luck!


And while you're doing all that you take notes and pictures and you can put up a guide for others.


@Renan de Araujo the PSU is a complex switch mode power unit. Very difficult to diagnose unless something has exploded. The simple test is.... locate the internal logic board reset button (I'm on a train right now or if do it fir you) hold down button for 15 seconds.... THEN apply power via mains lead. If there are no leds on the logic board lit up..... you PSU is dead. Taking it to an Apple Centre is a waste of time, they are not trained to deal at this level, not even close


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I repair computers, but 'repairing' power supplies can be EXTREMELY DANGEROUS - and if you are not a certified 'bench technician', it may even be fatal.

That's because there are numerous high-voltage leads and components inside the power supply... leads and components that you DO NOT WANT TO TOUCH OR BRUSH AGAINST IN ANY FASHION, lest they accidentally discharge stored voltages directly into your person.

This is not wise - do NOT attempt to 'repair' computer power supplies yourself - replace the entire supply? Sure, that's relatively safe. But that the cover off and 'repair'? That is about as poor an idea as attempting to take the cover off and 'fix' an old tube tv set (voltages from which can also kill a grown person).

Good luck, and be safe whatever you do.

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First I think your point of it being dangerous it valid when you work on any live circuit without having an isolation transformer & GFI outlet'ed bench to protect your self. With that said, working on a non-powered power supply is mostly safe by taking care of any charged high voltage capacitors if needed. As to certification, I don't think certification proves one has the skills, only the book knowledge the courseware offers and how good one is in parroting the answers back. Whats more important is getting the manufacture training, getting good product repair documentation and following it. I can't count how many CRT based Macs or PC & Mac power supplies I've worked on. I never got zapped, as I took the correct precautions. Todays systems are much safer than what we had just a few years ago, and on the most part it's just easier to replace Vs repair PSU's on the newer systems.


As to killing you, there is little risk on that happening in todays systems unlike the original 128 & 512 Macs with their CRT's. Thats not to say any dummy can fix a CRT or PSU blindly, then you're asking for trouble.


Agree with Dan 100%. yabbadoody, I hear what you are saying, and nobody here wants anybody get hurt, but it is most certainly within the scope of a good DIY'er, to repair any power supply with the proper tools and precaution.


Sometimes. . . seeing the questions, assumptions, and reading comprehension of users exhibit. . . I am tempted (but resist) questioning the ability of some of those posing questions to accomplish even basic DIY repair. I often try to stress how complicated and daunting advanced repair can be - that knowledge, tools and experience are required - about which we know nothing other than what the poster provides (when, and if, they do).


Thank you very much for the advices, but after the warnings I realize I am not capable of performing the fix and understand why it's advisable not to, which also explains why we can't find any how to's on the subject.

I am going to take the computer to the authorized center again and hope that they fix the PSU this time, without charging me.


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These particular PSUs fail because of bad factory work.

They would need to have been properly flowed in the soldering process at factory.

$@$* like this is what makes us lose faith in Apple.

How can they dare ship MacPros with these dodgy PSUs, and won’t get them replaced, they’re so smart as to never ever let them die within the guarantee period.

Then they suddenly fail. Almost always just after the period ended.

$@$* PSUs, I guess Delta (the provider) is using monkeys in the soldering plant at their factory.

And eBay sellers are just making a profit on selling replacement units that maybe are just refurbished units that will fail also given enough time.

We gulp this and cope with this because of a brand’s undeserved reputation.

It’s all been a money drain since Steve Jobs left us.

Apple is no longer a winner game, it’s all bells and whistles but they don’t care about the power going to their MacPros. Please take the Pro nickname out, it’s not deserved.

They put us through all this $@$*, this hoops because they want us to obligue and not use our 2008-2010 MacPros anymore, they need to make a profit from us, they need to get us to buy a new “umbrella-cube” 3k-4K machine just because.

I hate those tactics.

Btw, it’s all about the soldering quality from factory, the damned relay switch inside the PSUs, and/or the temp sensor &&^&^$^ with all the security settings for switching it off just because.

No one wants to determine the real culprit because mos people are better off selling you a 200 or 300 bucks replacement.

Technical progress has become only a money drain and a huge waste of otherwise repairable units. Obsolescence and customer-obliguing tactics are the norm. No one cares anymore and they just are waiting for us to shell out the cash for a psu which could probably be repaired for ten or twenty bucks.

Welcome to never ending progress and never ending dissatisfaction.

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Couldn’t agree more. Probably spent 30-40k on Mac products over the past 15 years. MacBook Pro 2012 and 2010 Mac Pro both died in the past 3 months. Over 7k in total lost. I type this on a 6s+. Had iPhone since the 1st. This will be my last.mac has gone pc. All about the money. Nothing pro about it anymore :-( rip Steve jobs


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1: The likelyhood of the belt delivered by the smoothing caps in one of these being fatal. is at best slim. as yet there have been NO recorded occurences. if its th USA model, that slim chance is even slimmer, as the USA uses a girly 120vac as oppose to our manly 240vac in the UK. The belt itself, is a discharge... i.e it exists transiently until the caps discharge.... about half a seond. once they are discharged, they are safe. What does it feel like? I can only speak for the 240vac version, and have this to say about it... IT HURTS LIKE A B!TCH!! Anyone with heart problems may want to re-evaluate thier decision to work on an undischarged unit.. DISCHARGING: to make-safe the unit it can be actively be discharged by the deft employment of the end of a sizable flat blade screwdriver, and shorting out the 2 terminals on each of the capcitors. A small 'tick' noise will be heard the first time you discharge, the second time there will be no noise, this being your evidence of a completed discharge ALL OF THE ABOVE IS WRITTEN WITH THE ASSUMPTION THAT YOU HAVE ALREADY DISCONNECTED THE MAINS SUPPLY. NB there is a theoretical risk of damaging the capacitors during discharge, although I've never known it to happen. I have infront of me... one dead A1186 PSU, which I'll repair tomorrow (is midnight right now) - I'll post my answers/findings shortly after, HOWEVER, even without taking it apart, I can already tell that the fault on mine is on the 240vac inlet side (2 tests... test 1, there is a tiny white diag button on the logic board, dead centre behind the memory caseing. Press it, if you get no lights (next to button) at all, the ONLY conclusion you can rely on is it is 90% the 240vac inlet. Test 2, when plugging in the power cord, you should hear a small mains arc at the power cord socket.... if no sound, and no light from test 1, then it is 100% the 240vac side of the PSU (ie, youve just eliminated half the PSU).... more to follow

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I disagree with the notion that board repair is not a DIY job. Almost everything can be a DIY job if you're willing to invest the time and money in buying the equipment and learning the trade. I am now competent in microsoldering after watching hours of youtube videos and purchasing some entry-level equipment. Yes, you will have to fumble through it to get good, but I hate it when people discourage others from trying, and dismissing it as professional only. At this time, I have this exact PSU torn apart on my bench, energized with an isolation transformer, and I'm tracing down a missing 5V signal on pin 3 of connector C. This can be done if you educate yourself and are safe. I came here looking for clues and all I got was a bunch of people saying that "you can't". I don't believe in that. Just be safe and learn about the danger, and take your time.

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@densmith123 - Clearly you made the investment! Most people don't go into learning the needed skills to attempt the deeper repairs.

We try to read the OP's skills set by what he has written "I do not understand much of PSU," clearly Renan doesn't have them,

We tend to stick with subassembly repairs here on the computers. And if the given task is not overly hard or puts you at physical risk.

Even with guides people don't read them fully ;-{ Just look at this question Used a metal to unlock display cable, sparked and Mac restarted. Dead.



Point well taken Dan! Thanks for the feedback.


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Renan de Araujo wird auf ewig dankbar sein.

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