Q: "There is no connected camera"

Julia Patt wrote:... what do I do to connect the camera?

That may depend upon what Mac OS X version you are using in your MBA. 

Start with the suggestions in Apple's http://support.apple.com/kb/HT2090. Be sure to test more than one Apple camera-enabled application in more than one user account.  If none of them work, the "reset" suggested there often restores normal camera function.

(Over time, Apple has changed the built-in camera's name on newer Macs from "iSight" to "FaceTime" and then to "FaceTime HD." Regardless of the name of your Mac's built-in camera, the same info and troubleshooting applies.)

If you are still having trouble, applying the latest Combo Update for your Mac OS X version may get your camera working again.

Hi

I'm having a similar problem to Julia above, with my Macbook Pro (OS X 10.9.4). Skype, FaceTime and Photo Booth all reporting that no camera is connected.

I've followed the steps suggested in http://support.apple.com/kb/HT2090.

Step 3) is "Find out if the computer recognizes the iSight." When I check, "FaceTime HD Camera" IS showing up in the USB Device Tree (at Applications > Utilities > System Information > Hardware > USB).

So do I not need to move Step 4 (the PMU reset)?  What can I try now that I've established (I think) that the computer is detecting the camera (but the above applications aren't)?

cjyeates wrote: ... So do I not need to move Step 4 (the PMU reset)?  ...

Wrong.

cjyeates wrote: ... What can I try now...

The rest of the Troubleshooting suggestions (including Step 4) until you find one that fixes your problem.

You can also try OS X Mavericks 10.9.4 Update (Combo).  If needed, you can also try Reinstalling OS X 10.9.