ISight failure on 3.06 iMac

Hi Everyone,
I have just received my latest 24 inch iMac a 3.06 Ghz with 8800 GS graphics. Its really fine but there is just one problem with the iSight camera I do not get with my two white 2.16 Ghz 24 inch iMacs.
I have Skype on all three machines but on the Aluminium model I loose the iSight Camera after finishing a Skype session and can only get it back again after a restart. Neither Skype, nor Photo Booth nor iMovie nor iChat can find the iSight after a Skype session.
I have turned off video automatically starting iChat in iChat prefs.
Any ideas anybody?
Latest .... cannot now get iSight at all in anything.

Hello Alan Williams  
Try the suggestions in Apple's How to Troubleshoot iSight.
If your ONLY problem in ANY user account comes from using Skype, unless you get an answer here, check Skype's comprehensive Help system or search or post in the dedicated Skype Forum for Mac OS X. The Skype users who post there may be able to help you.
EZ Jim
PowerBook 1.67 GHz w/Mac OS X (10.4.11) G5 DP 1.8 w/Mac OS X (10.5.2)  External iSight

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