serial number suddenly disappearing after some clean installs
So i'm having some issues with my MacBook pro 13" mid 2014 model.
Some time back I tried installing Linux ubuntu alongside Mac OS-X on it (which obviously wasn't a good idea.
After not really ending up using it and having a few issues I just deleted the Linux partition in disk utility. This lead to the system being slightly unstable when booting, after updating to MacOS Sierra my Mac ended up having loads of boot loops which could only be fixed by clicking reinstall in the recovery mode. I was sure the problem had something to do with grub so I ended up doing a clean install with a TimeMachine backup. This didn't work the first time around since I let my Mac take everything from my TimeMachine backup including programs. However when doing the second clean install where I opted to not let my MacBook copy programs that fixed the boot loop problem.
But now after doing all these reinstalls MacOS doesn't recognise the serial number on my MacBook leading to stuff like iMessage not working at all.
So does anyone know how I could possibly get my serial number back?