i have a ALC 880 chip.input is not working.so i'm notable connect mic.But i have a Microsoft Lifecam VX 3000 which has a built in mic.How can i use it.My webcam is detected as USB Camera.

in sound input USB camera is detected.but when i use it.no audio is recorded.

USB camera:

Version: 1.01
Bus Power (mA): 500
Speed: Up to 12 Mb/sec
Product ID: 0x00f5
Vendor ID: 0x045e

any one have same cam.please help me i badly need it.this is the only problem i have in mac.
thanks

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MAC OS x : Yet to figure out version.
CPU:AMD E-350D APU MOBO:GA-E350N RAM: 4GB 1333Mhz GPU: AMD Radeon HD 6310
HDD:Seagate 160GB SATA DVD-RW: Transcend USB Burner USB Mouse & Keyboard
WebCam: Logitech C910

Chipset:
AMD Radeon HD 6310
North Bridge: AMD A45 FCH