Hello amnion and welcome to Apple Support Communities,

The serial number is embossed on the bottom of your MacBook Pro:

MacBook Pro: How to find the serial number - Apple Support

Is there a reason you need it?

The logic board may have been replaced.

Ciao.

TThanks for your reply. What I failed to mention in my initial post is that I installed a Yosemite Development Build. So the serial number does not appear in the About This Mac display which says it is not shown as an ID and my iMessage and other processes which require the internal serial # arent functioning because of this issue. So how do I get it back as an internal display?

" Yosemite Development Build"...." iMessage and other processes which require the internal serial # arent functioning "

Uhhh so a beta version of Yosemite? Some of those other processes have not been working even with the latest version of Yosemite.

The serial number should still be on the bottom. Even if the bottom is changed the Apple standard operating procedure is to write the serial number on the inside of the new bottom case.

" arent functioning because of this issue"

So it's asking you for the serial number?

yes it is happening with me as well!!!!

serial number unavailable in about this mac

any help should be great

Hey Sarwar,

So which Mac is this on? Model, size and year. What OS are you running?

Apple MacBook Pro "Core i7" 2.2 15" Mid-2014 (IG) Specs

Identifiers: Retina Mid-2014 15" - MGXA2LL/A - MacBookPro11,2 - A1398

MAC OS X  10.11.6

And you've tried to find the serial number on the external case:

How to find the serial number of your MacBook Pro - Apple Support

The other places (as that article says) are:

"

• On the original product packaging
• On the original receipt (or invoice)"

and no work was ever done on the computer?

Never any repairs done. I have serial on box & bottom of mac.

From terminal you can determine the serial number of the board if it has been correctly flashed:

copy and paste:

ioreg -l | awk -F\" ' /IOPlatformSerialNumber/ { print $4 } '

Since you have the serial number there is probably a glitch in the latest version of the OS you're using. An update might help or the problem might go away with newer updates. Reinstalling? Eccchhh!! I never have this problem but then I'm still using 10.9.5. Never use the latest OSs unless I am forced to.

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