Q: Internal camera problem

Hey guys, since I updated to Yosemite, my mac air 2011's camera hasn't been working. I've tried all the suggested solutions. ie. reset smc, kill vda assistant thingy, create a new user to see if camera works there, all not working. I've also done a hardware diagnostic test and it says no issues detected either. So what other solutions can there be since this is obviously related to the update? Thanks!