Audio/Video on amd64 Lenny

["Larry Irwin" <larryi@ccamedical.com>]

I have the most recent updates to amd64 Lenny on my system.

A Plantronics headset is plugged into the standard audio plugs for speakers 
and microphone.
The sound comes to the headset, but the microphone refuses to work.

A Logitech QuickCam is plugged into a USB port.
Nothing I have tried will bring up the webcam.

My other devices (1920x1080 screen, USB stick, USB external HD, DVD/RW, NIC, 
Printer, etc) are all working well.

What should I post to help pinpoint the audio and video issues?
(I'm used to setting up servers vs. desktops and have only had issues like 
this when sata was not quite segregated from ide on some motherboards...)
TIA,
Larry Irwin