Help! isight doesn't work in the morning, but work in the afternoon...

Hi everyone, I am almost mad with my isight.....I found when I start the laptop in the morning, it doesn't work, it shows"there is no connected camera". But I keep using the laptop for several hours until the afternoon, then I open the isight, it turns out working as normal.....as long as I restarted, it doesn't work again, until waiting for several hours.....I tested these for several days....so strange.
I tried all the ways mentioned in the "troublesome isight", none of them work. Should I reinstalled the systems or send it to the technical support?
Thank you so much in advance for you replying!

xiqing wrote:
Hi everyone, I am almost mad with my isight.....I found when I start the laptop in the morning, it doesn't work, it shows"there is no connected camera". But I keep using the laptop for several hours until the afternoon, then I open the isight, it turns out working as normal.....as long as I restarted, it doesn't work again, until waiting for several hours.....I tested these for several days....so strange.
I tried all the ways mentioned in the "troublesome isight", none of them work. Should I reinstalled the systems or send it to the technical support?
Thank you so much in advance for you replying!
Welcome to Discussions, xiqing
I understand that you have tried all relevant suggestions from http://support.apple.com/kb/HT2090
Restart your Mac and try the PMU/SMC reset one more time. If properly resetting your SMC does not resolve your problem, I think your problem you describe is a hardware one that will require professional service by your Apple-Authorized Service Provider.
You could try reinstalling Snow Leopard and applying the 10.6.4 Combo Update, but I do not believe that either could resolve the problem you describe.
*Be sure to backup all your important data files immediately before sending or taking your Mac for service*. When you retrieve your Mac after the work is complete, ask the AASP to show you that the camera is working before you leave the store.
EZ Jim
Mac Pro Quad Core (Early 2009) 2.93Ghz w/Mac OS X (10.6.4)  MacBook Pro (13 inch, Mid 2009) 2.26GHz (10.6.4)
LED Cinema Display  G4 PowerBook  1.67GHz (10.4.11)  iBookSE 366MHz (10.3.9)  External iSight

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