I do not share your problem. Here is how to fix it:
• If you have not already done so, shut down Mac, restart,
and try again. If the iSight still does not work, continue.
(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 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 Lion Combo is here:
• 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 the camera. Contact an Apple-Authorized Service Provider for hardware help.