So, My first reaction was to create a nandroid backup (of the black blank screen OmniROM) then wipe everything (data/factory, cache partition and dalvik cache) in CWM Recovery v184.108.40.206. After this I restored my old nandroid backup, this is my backup i created before i moved onto OmniROM so it was the Samsung galaxy s3 stock 4.1.2. So once i did this i was again greeted with the error message saying "Stystem UID's Inconsistent" with a button saying "I'm Feeling Lucky". So i clicked the button and set up my device. During this and after this Ive had about a billion pop up error messages saying "Unfortunately, the process com.google.process.gapps has stopped." and "Google books has stopped working" and it did this for all the other google apps. So its pretty clear that it must be something to do with Gapps (Correct me if i'm wrong please). Also, It did not allow me to get anything from the play store apart from twitter and rom manager. snapchat and the google app updates didn't work (that is all i have tried). I had error messages saying that i couldnt download it. I have tried installing gapps and OmniROM again and it works but i still get the error messages saying that gapps and google apps have stopped. I have also restored by nandroid backup of the omnirom (that I did before i wiped everything) and i still get the blank black homescreen.
So, I want to know whether it is gapps that has caused this? If so what do i need to do? Do i need to unistall it and install it again? How do i do that?
All I want is to go back to OmniROM and it works and this problem wont happen again. Also if i can get all my data (apps, pictures etc.) that i saved in my nandroid back that i did when i was on OmniROM (before i wiped everything) then that would be great!
I appreciate it very much if you have read this and helped me out.