ISight is not working after upgrade to Mountain Lion.

Please help!
After upgrade to Mountain Lion, Skype, Photobooth and etc can't detect iSight.

I tried the SMC option for my Mac (version details below)...but this still didn't solve my problem.
Model Name:
MacBook
  Model Identifier:
MacBook7,1
  Processor Name:
Intel Core 2 Duo
  Processor Speed:
2.4 GHz
  Number of Processors:
1
  Total Number of Cores:
2
  L2 Cache:
3 MB
  Memory:
4 GB
  Bus Speed:
1.07 GHz
  Boot ROM Version:
MB71.0039.B0E
  SMC Version (system):
1.60f5
  Sudden Motion Sensor:
  State
Enabled
In fact when I check under "About this Mac ==> More Info ==> System Report ==> Hardware ==> USB"
this is what I see:
-> USB Bus
      -> BRCM2070 Hub
             Bluetooth Host USB Controller
          Apple Internal Keyboard/Trackpad
      -> USB Bus
      -> USB High-speed Bus
      -> USB High-speed Bus
I find it hard to beleieve that the OSX Mountain Lion upgrade (from OSX Lion) can conk the camera hardware. All softwares such as Skype, Facetime, Image Capture show "No camera detected" after the OSX Mountain Lion upgrade. All of these were working perfectly fine before the upgrade.
Any help in this regard would be highly appreciated.
Regards,
Vishy

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