Camera not working after screen assembly replacement?

"Will 100% be a faulty assembly, unless you plugged the camera cable in with the battery connected (in which case you probably blew out a ferrite bead on the logic board). I have had an assembly before with the same issue.

Bare in mind, pretty much all of the assemblies sold on eBay and Amazon are stock with minor defects. The suppliers selling these buy them from China as grade A, but they are essentially assemblies Apple couldn't use during manufacture of the MacBooks (minor marks on screen/aluminium, small dead pixels, camera not working, etc).

There are some new 100% original assemblies, same stock as Apple service centres themselves use (sealed grey bag with black stripes, ""gamma tested"" stickers on screen film), but you will have to find a supplier of these yourself, since 3rd party repairers shouldn't have access to these parts. They are out there though, and you will have no problems with these at all."

The iSight Camera apparently has an individual ribbon cable conncecting it to the motherboard. I know this is stupid: Is the cable for the camera in correctly? If you are willing to, go to step 10 of this guide and that will show you how to reseat the cable. If that does not fix it, it may be another hardware issue, or even a software issue. Hope this helps!