About This Mac doesn't display system serial number!

Hello. I've had this for a couple of months now and it wasn't up to now that it really started worrying me.
Just a month after I bought my MacBook, I had to send it in for repairs (logic board fried... in one month!) and after I received it, I noticed something strange. When I open  > About This Mac and look for my serial number... it just... doesn't show any. It shows either SystemSerumb or SystemSerialNumb. Why? How? What?
How can I write down my computer's serial number as it's supposed to be written? I know the number: I have it on the laptop's box and "under" the battery, so I won't write it wrong...
Help!

There is no need to be concerned as software does not ask for serial numbers.
Software may look at existing hardware as CPU type or RAM or Disk space as well as OS version, previous installation, possible registration, but not the serial number.
Technically, a serial number is more a software designation of the hardware, not hardware itself.
Message was edited by: roam

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Hi BDAqua
I may put this off a bit as the issue was present when booted in Safe Boot.
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https://openradar.appspot.com/12016584
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You can open System Profiler and see if it contains your serial number.
Or have the computer near a previous connected Wifi or on a Ethernet cable to your router.
Reboot holding the D key down for like what would appear to be 10 minutes until Hardware Test appears on the screen.
You can run a test if you wish.
There is a pane at the top if selected will give you your new serial number.
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system_profiler |grep "r (system)"
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Serial Number (system): C24E1322XXXX
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Open Utilities > Terminal. Copy, paste and press enter:
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Serial number unavailable in about this mac

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" 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?

About This Mac doesn't display system serial number!

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