I just replaced the front camera on my Galaxy S4. After reassembling my phone, I come to find out that everything works perfectly but for some reason the menu button doesn't work. The menu button lights up when I tap the back button, but the menu button doesn't respond when touched. I have checked for visible damage and assured all connections were properly secured and still no luck. I have rebooted several times as well. What should I do? And if no obvious solutions, what would need replaced to return functionality?