ISight unavailable or missing

I have a new MBP and have had constant problems with the built in iSight. Regularly iChat or Photobooth report that the iSight was in use. Other times I check my hardware profile and the USB section shows no sign of an iSight even connected. I've tried multiple SMC and pram resets, sometimes it helps for a while and other times it does nothing to fix the problem. I've also tried replacing the QuickTimeUSBVDCDigitizer.component and it temporarily fixed the problem, but it's back again. This time I did an SMC reset and rebooted, check my hardware profile and can see the iSight under the USB section, I boot up iChat and don't see the video options. I go check my hardware profile again and now the iSight it gone. I'm out of ideas and thinking this needs to go back. Any thoughts?

My thoughts, fozy ...
Digital Video, like that from your iSight, needs LOTS of bandwidth for transmitting its large video data stream. Because of the way USB works, all devices that share one of your Mac's USB channels share that channel's bandwidth.
I do not know whether your built-in iSight shares a channel with either or both of your MBP's USB ports, but, if it does, having USB devices like your USB receiver connected while you are trying to use iSight video could cause your problem. Other USB devices including external USB hard drives can cause such problems, too. If disconnecting other USB devices lets your built-in iSight work, the easiest workaround is to disconnect them while you use your iSight.
If you cannot disconnect other USB devices when you need to use your built-in iSight, my first suggestion is that you check with the device vendor to find whether there are known issues or software updates that could help you.
If the vendor has nothing that helps but you must have a conflicting USB device connected while you are using video, consider using a Firewire webcam like iSweet Firewire Webcam or Unibrain FireWire WebCam - Fire-i rather than your USB built-in iSight for those video needs.
However, Firewire is NOT a cure-all. Bandwidth is so critical to DV that even my Firewire external iSight is subject to hardware or software conflicts when I have certain other Firewire devices connected while I try to use my iSight. Therefore, unless you can take your nicely portable MBP with you and test before your buy, disconnecting is likely the most certain solution. (It is also surely the cheaper option! ;-))
Cheers,
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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    Language                         : English
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    Tagged date                      : UTC 2012-12-13 09:33:19
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    ID                               : 3
    Language                         : English
    Encoded date                     : UTC 2012-12-13 09:33:19
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