Not booting past load screen

I have a MacBook A1342 that needed a logic board and keyboard replacement. When testing both the new board and keyboard everything worked fine. I had everything clipped in place but didn’t remove the old keyboard just yet. After doing a teardown and removing the old keyboard and replacing it with the new one and rebuilding the MacBook back together the laptop won’t boot past the load screen. All I have on the screen is the Apple Logo and the load bar goes half way across. It has been like this for about 2 days. So far, I can’t get into safe mode. Has anyone any ideas on what the problem could be?