ISight "Camera in use" error!

When using iChat or Photobooth the iSight camera is always reported as "The Camera is in use by another application". This is not true as iChat is the first item I open after a fresh startup.
I have looked far and wide on the Apple support site and via google but to no avail. This problem is really annoying as I Cannot use iChat or any other application with the built-in iSight camera.
I have tried re-installing Quicktime which seems to be a possible solution for some but it does nothing for me. The two Apple support items also fail to do anything for this problem.
Does anyone have any other options to troubleshoot this?

Welcome to Apple Discussions,William Munro
Here is the latest list of possible fixes as of this date:
If you have not installed any new hardware since your iMovie worked correctly, it is possible that your problem may be hardware related. However, unless you get better suggestions from iNtel Mac users, here are some common solutions that help most avoid a visit to their Apple Service Technician.
None of the suggestions is complicated, but the only way to find which one will work for you is to try them one-by-one until you find the one that fixes your Mac.
(0) Disconnect any unnecessary peripherals while you do your testing to rule out possible conflicts. 
(1) Restart your Mac. Sometimes that is all that is required.
(2) (You have already ruled out this one.) If you use VMware Fusion to run Windows on your Mac, consider disconnecting iSight from your Virtual Machine as recommended above by user "The.VCI" in his post in this thread.
(3) If you use an HP printer/scanner with your Mac, consider the "daemon" suggestions from user "parkersal" in this post.
(4) Check for any running applications, Login Items, or widgets that can use your iSight. (It is easy to forget widgets like Mirror in your Dashboard.) As explained in Apple's iSight "Your camera is in use by another application" message, iSight can be used by one application at a time.
(5) Try every suggestion re: Built-in iSight in How to Troubleshoot iSight. Be sure to include the checks for whether the problem is "application-specific" and "user-specific".
Click here if you need help creating a new user account to check whether your problem is "user-specific" during Troubleshooting.
(6) If resetting or the other troubleshooting suggestions do correct your problem, try the following:
• Backup your Home Folder, or at very least, your important files.
• Repair permissions. (Click here if you need help.)
• Then download and apply the Mac OS X 10.4.10 Combo Update v1.1 (iNtel).
• Finish with another Permissions Repair, and then check your iSight again.
Users have reported fixes to a variety of audio, video, connectivity, and software conflicts and unreliability issues after properly applying Combo Updates.
(7) Some iNtel Mac laptop users have also reported success after unplugging their Macs and leaving the battery out for half-an-hour to overnight.
(8) If none of these suggestions help, take your iMac to your Apple-Authorized Service Provider for a professional check.
EZ Jim
PowerBook 1.67 GHz   Mac OS X (10.4.10)    G5 DP 1.8  External iSight

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    Message was edited by: Highjinx

    Highjinx wrote:
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