ISight has stopped working

I have a Macbook Pro connected to a 24" cinema monitor. Recently when I wish to use the camera it tells me that it cannot connect as it is being operated by another programme but I do not have any other programme. Can anybody advise how I can overcome this

hairy scotsman wrote:
I have a Macbook Pro connected to a 24" cinema monitor. Recently when I wish to use the camera it tells me that it cannot connect as it is being operated by another programme but I do not have any other programme. Can anybody advise how I can overcome this
Welcome to Discussions, hairy scotsman
(1) I suggest that you first disconnect your 24" LED monitor and separately test and troubleshoot the iSight built into your MBP until you are confident that your inbuilt iSight works properly and reliably.
Once your MBP's inbuilt iSight functions correctly, you can reconnect your LED display. Your LED display's iSight then should be usable again.
If you need help selecting which iSight to use with a given app, some info is available here:
  http://discussions.apple.com/thread.jspa?messageID=11355158&#11355158
(2) Merely restarting your Mac may correct your iSight's problem. If not, try all relevant suggestions for built-in iSight from:
  http://support.apple.com/kb/HT2090
If your iSight problem occurs in more than one app and more than one user account, the reset suggested there often restores proper function of inbuilt iSight.
If the problem is in only one app, resetting the preferences (deleting the .plist file) for that app may correct the problem.
(3) If your MBP's iSight works, but your LED display's iSight does not, consider the suggestions in
  http://support.apple.com/kb/TS2400
(4) However, if after carefully following all the above suggestions, one of your iSights works but the other neither works nor shows as a USB device in your Mac's System Profiler, you likely have a hardware problem with that iSight. In that case, contact Apple or an Apple-Authorized Service Provider for service.
EZ Jim
Mac Pro Quad Core (Early 2009) 2.93Ghz w/Mac OS X (10.6.3)  MacBook Pro (13 inch, Mid 2009) 2.26GHz (10.6.3)
LED Cinema Display  G4 PowerBook  1.67GHz (10.4.11)  iBookSE 366MHz (10.3.9)  External iSight

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