Also, I have just checked it and my camera works, both front and back facing.
So, I followed this guide in order to fix my A button. While re-assembling the device, I found the "Camera ribbon cable" rather tough to put back into its socket. Thinking that I don't use the camera very often, I decided to leave it undone. After completely re-assembling, however, I found that my top screen wasn't showing anything. I have tried re-connecting the cable, which I have succeeded at, but the top screen still pulls up blank. The screen works, but doesn't display anything but a dark gray. On a brighter note, the A button works, so thank's for the help with tat, but I need to fix my top screen. If anyone knows what the problem might be, please help. Thank you.