Apple hardware test - error 4MEM/9/40000000: 0x84cdd498

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epdcampbell Author

Level 1

4 points

Apple hardware test - error 4MEM/9/40000000: 0x84cdd498

My Macbook Pro early 2011 15" model randomly shutdown the other day and since then has been in a reboot loop.

I am on OSX Yosemite.

I have already tried the following steps which haven't worked:

- Reset PRAM

- Reset SMC

- Couldn't go to recovery mode or safe mode

- Tried internet recovery mode

I have now just done an apple hardware test and it has detected this error:

4MEM/9/40000000: 0x84cdd498

Please can someone inform me of what the hardware error is.

Thanks

MacBook Pro, null

Posted on Apr 10, 2018 4:50 AM

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Answer 1

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y_p_w

Level 6

17,738 points

Apr 11, 2018 7:07 AM in response to epdcampbell

That's a memory error. The cause could be anything from a bad socket, bad trace, or failing memory. Failing memory is the most likely. You can find instructions on how to access the memory here:

MacBook Pro: How to remove or install memory - Apple Support

I'd suggest trying out a single memory at a time to isolate which module or socket may be the issue. It should boot on a single module, although it's not ideal. It's kind of a logic problem isolating the issue.

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Answer 2

raina_b22

Community Specialist

Apr 11, 2018 5:38 AM in response to epdcampbell

Hi there, epdcampbell!

Thanks for reaching out to the Apple Support Communities! It sounds like you are having an issue with an error code when you run the Apple Hardware Test and I am happy to assist. Based on the error message you are seeing, I recommend you check out this link to Contact Support . This will get you in touch with Apple and they will be happy to proceed with further steps.

Take care!

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Answer 3

Limnos

Level 10

421,831 points

Apr 11, 2018 5:39 AM in response to epdcampbell

Using Apple Hardware Test https://support.apple.com/HT201257 - "Apple Hardware Test (AHT) contains a suite of diagnostics that will test the hardware of your computer. It's a great way to rule out a hardware issue when troubleshooting your computer." "Important: If your Mac was released after June 2013, you will use Apple Diagnostics rather than Apple Hardware Test (AHT). See Using Apple Diagnostics for instructions - http://support.apple.com/kb/HT5781"

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