Have you ever met this? I have been recently suffering from nVidia issues on my mid2012 i7 15' MBP. It freezes all the time, have little squares, and lines on screen, when frozen. It wouldn't be a problem, because I have Apple Care, BUT! As far as I am experiencing these issues, my motherboard forgot it's serial no.
It's like if I had already changed my logic board, it says 'System Serial#'. I am working with Macs, I am repairing them since 2010, but I've never seen anything like this, and this machine's logic board hasn't been changed, that's for sure, bcz it's my own. I attach some pictures, where you can see, that hardware monitor app recognizes that I have 'switched' computer, but remembers an older machine (with my serial no.), which is quite similar.
![Macbook pro 2012 serial number lookup Macbook pro 2012 serial number lookup](/uploads/1/2/5/6/125640609/879349227.jpg)
Fix missing Macbook Pro Serial Number I’ve a Macbook Pro 13″ mid-2012 (non-retina) model running macOS Sierra 10.12.6. Recently (I don’t know what I did) I noticed that my Serial Number is missing in “About This Mac” info. Mac Specs: By Identifier: Model Number/Family Number. For your convenience, the Model Number of each recent -- G3 and later -- Mac is listed below. For complete technical specifications on a particular system, click on the name of the Mac (left column).