Why is my Home and PowerButton not workimg

So you took the phone apart yourself and replaced out the camera correct?

And which camera was it the front or the back?

If you took the phone apart make sure that you check all of the plug-ins all your flex cable plug-ins as far as the charge port plug-in and the power button and LCD display plug-ins you could have a bad connection somewhere as far as your home button goes there are two prongs that touch the diodes that are connected and leads to the charge port make sure that those are touching, and also try a soft reset by holding your power button and your home button down at the same time and tell you see an Apple sign up here on your LCD screen then let it go and see what happens then if that does not work then check all your plug-ins