Why is my iMac's Face Time not working after El Capitan install?

[iMore Question]

Why is my iMac's Face Time not working after El Capitan install

2013 iMac Face Time will initiate call or receive fall, but then will quickly disconnect. Interestingly, face time's audio function working, but not video function. I am trying to connect to a late-2007 iMac.

 

[kch50428]

Re: Why is my iMac's Face Time not working after El Capitan install

Try the steps in this phone FaceTime Troubleshooting... do the same steps on the Mac...https://support.apple.com/en-us/HT201422