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Is it application specific?
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No, it seems to be complete. Not working in PhotoBooth, not working in iChat, not showing up in system profiler.
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You seem to have done everything here<br />
<br />
<a href="http://support.apple.com/kb/HT2090?viewlocale=en_US" rel="ugc">http://support.apple.com/kb/HT2090?viewlocale=en_US</a><br />
<br />
by PMU do you mean resetting the SMC?<br />
<br />
resetting the SMC seems to be the common solution
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Yes. I mean resetting the SMC. Not that anything appears to happen when I hold down the power button - should it make some kind of sound?
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Wide selection of solutions there, but none have worked for me. I'm guessing it's the hardware.
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<div class="content wysiwyg-content">
Built in iSight no longer works on my MacBook Pro. <br />
<br />
I have done a PRAM reset, PMU reset, run Onyx and nothing fixes it. <br />
System Profiler USB section doesn't show it. <br />
<br />
Any ideas? Thanks.
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Built in iSight no longer works on my MacBook Pro. 

I have done a PRAM reset, PMU reset, run Onyx and nothing fixes it. 
System Profiler USB section doesn't show it. 

Any ideas? Thanks.

No, it seems to be complete. Not working in PhotoBooth, not working in iChat, not showing up in system profiler.

You seem to have done everything here

http://support.apple.com/kb/HT2090?viewlocale=en_US

by PMU do you mean resetting the SMC?

resetting the SMC seems to be the common solution

Yes. I mean resetting the SMC. Not that anything appears to happen when I hold down the power button - should it make some kind of sound?

Wide selection of solutions there, but none have worked for me. I&#39;m guessing it&#39;s the hardware.

Built in isight not working on Macbook Pro

Built in iSight no longer works on my MacBook Pro. 

I have done a PRAM reset, PMU reset, run Onyx and nothing fixes it. 
System Profiler USB section doesn&#39;t show it. 

Any ideas? Thanks.

All of Apple's hardware is produced solely by Apple Inc., who determines internal systems, designs, and prices. Apple buys certain components wholesale from third-party manufacturers. The current Mac product family uses Intel x86-64 processors. All Mac models ship with at least 1 GB RAM as standard. Current Mac computers use ATI Radeon or nVidia GeForce graphics cards and include a dual-function DVD and CD burner, called the SuperDrive. Current Apple hardware includes the iPad, iPhone, iMac, Mac Pro, Macbook, iPod and Apple TV. Discontinued hardware includes the Apple I, Apple II, and the Apple III, the Lisa, the Newton, the Quadra, Performa, Centris, Macintosh II and LC series, the Power Macintosh, iBooks and the MacBook.