Q: The green light next to my camera lens comes on but the picture is black, how do I get it to come on?

•  If you have not already done so, restart Mac and

    try again.  If the iSight still does not work, continue.

• If Apple's http://support.apple.com/kb/HT2090

   suggestions do not help you, (are you certain that you

   used the correct "reset" procedure?), yours is most likely a

   hardware problem that will require a professional fix. 

   Unless you have a current backup, make one now.

  Then use the final "Troubleshooting" suggestion:

"... contact Apple or an Apple-Authorized Service Provider for service."

• If you want to try one more thing on your own first,

  use Disk Utility to repair permissions.  Then

  download and apply the latest Combo Update for

  your OS.  Currently, the latest SL Combo is here:

    http://support.apple.com/kb/DL1399

• Repair permissions again immediately following the system restart

   that completes the Combo update.

Properly applying the Combo version of updates can sometimes correct software problems, but, if your trouble is caused by a hardware problem, there are no user serviceable parts of iSight. 

Message was edited by: EZ Jim