Apple Hardware Test error: 4MEM/1/40000000: 0xb78e5f18

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Level 1

43 points

Apple Hardware Test error: 4MEM/1/40000000: 0xb78e5f18

Hi,

My iMac i5 has suddenly started showing Kernel Panic all the time, and I've now been able to run an Apple hardware Test (AHT) on it.

After 9 sec AHT stops and says there is an error named:

*4MEM/1/40000000: 0xb78e5f18*

I've with no result tried to google this technical frase.

I'd be very happy to know where to go for info on this error - and what to do now?

Contacting the local Danish Apple Service Agent when they open Monday morning, I surpose?

iMac 27' i5 - MacBook Pro 13' - iPhone 3GS 32GB - Time Capsule, Mac OS X (10.6.4)

Posted on Jun 26, 2010 12:33 PM

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Answer 1

Best reply

JaimieV

Level 2

490 points

Jun 26, 2010 12:41 PM in response to Dr. Wishbone

One (or possibly more) of your RAM sticks has gone bad.

See this thread - http://discussions.apple.com/thread.jspa?threadID=779745

Yes, call Apple on Monday and they'll replace the memory.

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Answer 2

Dr. Wishbone Author

Level 1

43 points

Jun 26, 2010 12:58 PM in response to JaimieV

Okay, thank You kindly, nice to know how to deal with it.

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Answer 3

R C-R

Level 6

17,782 points

Jun 26, 2010 12:59 PM in response to JaimieV

JaimieV wrote:
Yes, call Apple on Monday and they'll replace the memory.

Note that if you have installed aftermarket memory that did not come from Apple, you should remove it yourself since it is not covered by Apple's warranty. You can test by substitution to find the bad module(s) -- remove them one at a time, optionally substituting any Apple provided memory you are not using if you have any, & if an aftermarket one is the culprit contact the vendor for a replacement (if it has a warranty that allows that) instead of Apple.

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Answer 4

Dr. Wishbone Author

Level 1

43 points

Jun 26, 2010 1:10 PM in response to R C-R

Thanks for your concern, but I did not put any other RAM into the machine other than the ones it came with.

The iMac i5 guaranty is still valid. How is Apples procedure replacing defect RAM as in this case? I guess the RAMs have to be checked by Apple somehow?

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Answer 5

JaimieV

Level 2

490 points

Jun 26, 2010 1:21 PM in response to Dr. Wishbone

Apple will tell you what to do when you call.

Almost certainly it's just one stick that has failed so they'll probably have you just return that and carry on working with a temporary 2gig system while you wait for the replacement. I'm guessing, though.

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Answer 6

Dr. Wishbone Author

Level 1

43 points

Jun 26, 2010 1:27 PM in response to JaimieV

OK, fair enough.

Just that I'm considering upgrading to 8GB.

Possible to make some kind of deal with The Applemighty?

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Answer 7

JaimieV

Level 2

490 points

Jun 26, 2010 1:37 PM in response to Dr. Wishbone

No need! There are four slots on the 27" i5, so you can just order up a couple more 2gig sticks independently of this replacement.

I'd recommend Crucial rather than Apple - cheaper, and a lifetime guarantee. OWC are well commended here, too.

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Answer 8

Dr. Wishbone Author

Level 1

43 points

Jun 26, 2010 1:56 PM in response to JaimieV

Aha, nice with 4 slots!

I myself also prefer Crucial since Kingston (and now Apples own!) have failed me before.

However, I've read that mixing different kinds of RAM easily may lead to problems - like the Kernel Panic I have now.

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Answer 9

JaimieV

Level 2

490 points

Jun 26, 2010 2:54 PM in response to Dr. Wishbone

Not the case these days. As long as it's the right spec, it will work.

I'm using 2x2gig Samsung (I think) plus 2x1gig leftover Hynix from a Mini in my i5 at the moment. Not a moment's trouble.

Message was edited by: JaimieV

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