hardware test error 4MEM/62/40000000: 0x83d18e98

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b from k Author

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hardware test error 4MEM/62/40000000: 0x83d18e98

Hi all,

I ran a Hardware Test, and it came up with this error: 4MEM/62/40000000: 0x83d18e98

What is it, and what can I do about it?

Using a MacBook Pro (2011) with Mavericks

Thanks,

Ben

Longer Story: I did the Hardware Test in the first place because I had trouble with a external apple Keyboard and a external Hard Drive. Both weren't recognized, and of course still aren't. Found some posts about similar error codes, they seemed to be mostly about RAM. Can that cause problems with USB connected devices?

MacBook Pro, OS X Mavericks (10.9.5), Netgear WGR614, wireless internet

Posted on Jan 10, 2015 3:12 PM

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Answer 1

OGELTHORPE

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57,329 points

Jan 10, 2015 3:40 PM in response to b from k

That error code indicates that there is a problem with the RAM. Open the MBP and take out the two RAM modules, clean the contacts and reinstall them. Make certain that they are firmly seated. Check if both are recognized and see if the AHT will come back with no errors.

If the error reoccurs, Download from Kelley Computing Rember:

http://www.kelleycomputing.net/rember/

Run it overnight so that sufficient loops are executed.

b from k wrote:

Can that cause problems with USB connected devices?

Possibly. Once you get the RAM sorted out, then you should know.

Ciao.

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Answer 2

b from k Author

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Jan 12, 2015 4:41 AM in response to OGELTHORPE

Thanks for the advice! I did't have a small enough screwdriver at hand (I know ...), so I just skipped the part of taking out the RAM modules an ran rember right away. I did 50 runs which finished sometime last night, and it gives me "All tests passed!" both in the report and the log. Wonder where that leaves me at ...

Thanks ,

Ben

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Answer 3

OGELTHORPE

Level 9

57,329 points

Jan 12, 2015 4:48 AM in response to b from k

When you attach the external HDD, can you see it in Disk utility?

Ciao.

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Answer 4

b from k Author

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Jan 12, 2015 5:09 AM in response to OGELTHORPE

No, nothing there.

I will take the Drive and the Keyboard to work today and see if it shows up on any of the machines there. However, it does seem very unlikely that both just happen to be broken at the same time (especially as on of the keyboards I tried is brand new.)

Thanks,

Ben

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Answer 5

OGELTHORPE

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Jan 12, 2015 5:14 AM in response to b from k

Try a NVRAM reset:

http://support.apple.com/en-us/HT204063

Try all USB ports.

Try using different cables and other HDDs if available.

There may be a hardware problem with the USB connections. If so, the it becomes a trip to an Apple store genius bar.

Ciao.

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Answer 6

b from k Author

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Jan 12, 2015 5:44 AM in response to OGELTHORPE

Okay, did the NVRAM reset, tried both USB ports and different cables. All works fine with different devices, but neither the HDD nor the Keyboard show up.

I recently had another HDD problem. My backup disk is hooked up via a hub to the mac, together with two other HDDs. The two other still work, but backup doesn't. I figured it just somehow broke, but now, with these new problems, that seems weird, too. Any chance that my computer could have trashed those HDDs, or even a keyboard?

Thanks,

Ben

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Answer 7

OGELTHORPE

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57,329 points

Jan 12, 2015 10:28 AM in response to b from k

b from k wrote:

Any chance that my computer could have trashed those HDDs, or even a keyboard?

I have my doubts that could be the case. I think that the best option now is an appointment at an Apple store genius bar. Bring the recalcitrant HDD and keyboard with you.

Ciao.

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Answer 8

b from k Author

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Jan 14, 2015 7:51 AM in response to OGELTHORPE

Okay, I took all the stuff in its ragged glory to work and had the system administrator have a look at it. He found out the HDD was fried, and the (brand new) keyboard didn't work either. His verdict: probably something wrong with the USB-Hub I've been using.

So I'm replacing it and eveything else that got killed alongside. And then hopefully all will be well.

Thanks for helping out!

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Answer 9

Feb 1, 2015 8:50 AM in response to b from k

I have the same error code on AHT. 4MEM/62/40000000: 0x82e13a98. I did the test cause my daughter plays minecraft on my MBP 2011 and it reboots the machine after about 15 minutes of gameplay. Still can't figure out the problem. So, I'm trying the memory change thing and report it back here.

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Answer 10

Jun 2, 2015 6:37 AM in response to b from k

I'd be careful about blaming the RAM. Right now, I'm penning this on a MacBook Pro that will get very hot, even when under low disk/processor load, and then either lock up, or not wake up when the lid is closed. If I force a restart, sometimes it will work well, other times, give the three beeps indicative of a RAM problem.

I have extra RAM, and so have been able to test with both sets (and have swapped them out numerous times), but the same issues still occur. Also have done NVRAM and SMC resets numerous times, as well as run Apple diagnostics, which usually checks out.

Basically, I think what I'm experiencing is similar to others here--it may be tied to RAM sockets, or the logic board itself. Basically, it may be good to have a professional look at it to rule out other issues.

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