Fan issues, Apple Hardware Test said 4M0T/1/40000002 Master-2470

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Fan issues, Apple Hardware Test said 4M0T/1/40000002 Master-2470

As I mentioned earlier, I've been having weird intermittent fan issues where the fan would shut off seemingly at random. Today, as soon as iStats report 0 RPM I rebooted and ran the hardware test.

AHT reported an error while testing the logic board: 4M0T/1/40000002 Master-2470

I ran the test 4-5 more times and couldn't reproduce the same error again. It kept saying "No troubles found."

Right now the mac is working fine, the fan is on, I've done PRAM and SMC reset procedure 10 times over (I swear!) and it appears to work as expected.

Does anyone know what that error means ? 4M0T/1/40000002 Master-2470 ?

In the MacPro discussions they say it means the fan is not working. But in my case the fan turned itself on right after that test and I couldn't get the same error anymore. What is it mean ? Should I take it to the Apple Store ?

Mac Mini

Posted on Feb 19, 2008 7:30 PM

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Answer 1

Feb 19, 2008 9:34 PM in response to Oleg Dulin

One of my mini's fan does not spin up while start up at very low temperature. When the cup hits 95ºC to 100ºC, the fan goes off at very high speed. It only happen recently, not sure if it has anything to do with Leopard. I install the Fan Control, and now the fan turns on when start up.

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Answer 2

Oleg Dulin Author

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1 points

Feb 20, 2008 2:56 AM in response to Cup of Tea

Cup of Tea -- this sounds like an issue I am having. Can you run AHT when your Mac Mini is cold and post your findings, please ?

The problem is that at 100 C it is basically overheating. Normal temperature for a Core 2 Duo should be no more than 85 C... I too tried Fan Control but in some cases it didn't help with the fan spinning down so I uninstalled it to eliminate it as a culprit. I am using iStats dashboard widgets to keep an eye on things.

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Answer 3

Oleg Dulin Author

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1 points

Feb 20, 2008 9:55 AM in response to Oleg Dulin

ANyone ? Any thoughts ?

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Answer 4

Oleg Dulin Author

Level 1

1 points

Feb 21, 2008 3:18 AM in response to Oleg Dulin

I could reproduce it again this morning.

Fan went down to 0 RPM as per iStats. I restarted, ran the AHT which said 4M0T/1/40000002 Master-0 while checking the logic board. I then applied the PRAM and SMC reset procedures and rebooted. The fan is back on.

Should I take it to the Apple Store ?

My concern is that they won't be able to reproduce it and arrive to the same solution as myself and just send me back home having wasted my time.

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Answer 5

AndyO

Level 6

17,064 points

Feb 21, 2008 5:54 AM in response to Oleg Dulin

If you can reproduce this, and can show them an indication of the AHT fault report you have got when it happens, then there should surely be no problem with the Apple store staff also reproducing the fault. Also, while it's always possible they will not be able to help resolve this immediately, you can be certain that if you don't try, they can't do anything to help. A small amount of time seems a good thing to risk under the circumstances!

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Answer 6

Oleg Dulin Author

Level 1

1 points

Feb 21, 2008 5:58 AM in response to AndyO

I guess now the question is, why is Mini such a lemon ? The first one I got in December was dead on arrival, the replacement is having fan issues... Can I just get a full reimbursement from Apple ?

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Answer 7

AndyO

Level 6

17,064 points

Feb 21, 2008 6:16 AM in response to Oleg Dulin

A lemon? Your experience might suggest so, and certainly I'd probably think so too if I had encountered the same problem, but given the hundreds of thousands of these systems in daily use around the world this discussion area is incredibly quiet for the product to be generically poor.

If you are not happy with the system, then return it to Apple. Whether you can get a full refund or not is something no-one here can answer since we're all users like you, but one again, you can need to talk to Apple, either by phone or at the store. If you don't get a satisfactory outcome, then ask for the problem to be escalated upward.

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Answer 8

Oleg Dulin Author

Level 1

1 points

Feb 21, 2008 7:00 AM in response to AndyO

How do you escalate ? Is there a number I can call ?

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Answer 9

AndyO

Level 6

17,064 points

Feb 21, 2008 7:05 AM in response to Oleg Dulin

No, the number is the same, but if the first tier of customer support can't help (or seem disinclined to) then ask for the call to be passed upward. Second tier support are product specialists, and they can generally get into not only deeper discussion about specific product issues, but also wider options for resolution.

In store, you're only real escalation from the genius bar is to the store manager - they may well not have a lot of flexibility in terms of Apple's overall policies.

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Answer 10

Oleg Dulin Author

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1 points

Feb 21, 2008 7:34 AM in response to AndyO

That sounds suboptimal.

Anyway, I am going to take it to the store tomorrow and see if they can help me.

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Answer 11

Oleg Dulin Author

Level 1

1 points

Feb 22, 2008 5:06 AM in response to AndyO

Well, I now know how to reproduce it.

Basically, everything is fine until you do something that makes it reach a sustained 100% CPU load for about 10 mins. The temperature reaches about 85 C and stays that way and then the fan shuts off. Turning the box off for a few minutes without even applying the SMC puts it back into a working state and clears the AHT error.

I can't take my Mini to the Apple Store today due to the weather, but I am going to escalate. This Mini is supposed to be a replacement for a Mini that was dead on arrival and I expected it to be fully tested and working properly.

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Answer 12

Boece

Level 5

6,264 points

Feb 22, 2008 5:23 AM in response to Oleg Dulin

If the fan shuts off at 85 C, but the Mini continues to run, then you definitely have a hardware problem -- and the mini should be repaired or replaced, IMHO.

If the Mini doesn't continue to run under those circumstances, but shuts down instead, then that sounds more like "protective thermal shutdown", which is what the Mini is supposed to do if the cooling system can't keep up with the heat load.

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Answer 13

Oleg Dulin Author

Level 1

1 points

Feb 22, 2008 6:26 AM in response to Boece

I know, that's why I am tired of AppleCare giving me a runaround.

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Answer 14

Oleg Dulin Author

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1 points

Feb 22, 2008 6:28 AM in response to Oleg Dulin

Oh, and the reason I think they are giving me a rounaround is because the Mini with the fan issues is a replacement for a Mini that was dead on arrival.

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Answer 15

AndyO

Level 6

17,064 points

Feb 22, 2008 6:43 AM in response to Oleg Dulin

That's not a reason to infer you're getting the runaround, but given the history it may explain why Apple support may seem a little reticent to entirely believe you, because two faulty systems in a row is not at all common. They may, therefore, suspect there is some element of 'faulty user' rather than faulty system.

Given that it isn't the case, all you should have to do is patiently explain the problem as clearly and simply as possible, encouraging then person(s) you are dealing with to understand it is not a matter of you looking for a problem, but actually finding what is a fairly serious one.

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