So I traded my sg3 motherboard from a screen that was cdma to gsm

[AC Question]

( sprint)to a screen that is gsm tracfone) now the home button won't work is there any way to tell the android software to us the home button
the home button won't work on the installed mother board I found that the back plate isn't completely compatible with the motherboard but with a little dremel work i fixed other than that I don't know why the home button works the back button and menu button work but the home button doesn't ive swapped the motherboards back and forth to verify that it is't a broken button but it seems to be a software issue between the two different types any idea how to fix this? your help would be much appreciated.