How to know if my macbook built in i-sight is dead?

[goodatflash]

hi
I have find that my macbook's isight doesn't work suddenly, without anything strange happening (photobooth and other softwares couldn't recognize it). I first suspected google video plugin. uninstalling it didn't fix. then I ran SMC reset (power on for 5 sec while battery off), I have a macbook aluminum 13
the point is I still don't see the isight in my system profiler (in usbs),
could be my macbook's isight crash? anyway to check if it is software related or hardware issue?
here I post a screen shot of my system profiler
(so sad with my macbook, first my fan crashed, had to change the fan , and now the isight!)

USB Bus:

Host Controller Location: Built In USB
Host Controller Driver: AppleUSBOHCI
PCI Device ID: 0x0aa7
PCI Revision ID: 0x00b1
PCI Vendor ID: 0x10de
Bus Number: 0x06

BRCM2046 Hub:

Product ID: 0x4500
Vendor ID: 0x0a5c (Broadcom Corp.)
Version: 1.00
Speed: Up to 12 Mb/sec
Manufacturer: Apple Inc.
Location ID: 0x06100000
Current Available (mA): 500
Current Required (mA): 0

Bluetooth USB Host Controller:

Product ID: 0x8213
Vendor ID: 0x05ac (Apple Inc.)
Version: 1.80
Serial Number: 0025005E5E7D
Speed: Up to 12 Mb/sec
Manufacturer: Apple Inc.
Location ID: 0x06110000
Current Available (mA): 500
Current Required (mA): 0​