1st, the red line over your timeline would seem to indicate a case where your project setting is wrong for your video
Please NOTE that the PPro CS6 screen may look a bit different (I use CS5)
For CS5 and later, the easy way to insure that your video and your project match
See 2nd post for picture of NEW ITEM process http://forums.adobe.com/thread/872666
-and a FAQ on sequence setting http://forums.adobe.com/message/3804341
2nd, read Bill Hunt on Audio Conforming http://forums.adobe.com/thread/726693
>typical digital camera and they are AVI format
Please provide camera's exact brand and model... and read below
Read Bill Hunt on a file type as WRAPPER http://forums.adobe.com/thread/440037
What is a CODEC... a Primer http://forums.adobe.com/thread/546811
What CODEC is INSIDE that file? http://forums.adobe.com/thread/440037
Report back with the codec details of your file, use the programs below... a screen
maybe stupid but try this...
Double click one of your videos listed on the left. In that way they will open in source monitor. Click play below source monitor. If you here a sound then everything is ok with your captured video. If you don' hear a sound you had an error while capturing it from your camera or you don't have the right codec.
click and hold your mouse placed over your source monitor (a hand shaped icon will appear instead of an arrow) and drag and drop it to your timeline (workflow). you should be able to hear and see the sound on your timeline.
Maybe you draged it by pressing only video icon below the source monitor.
If this doesn't help then i don't know what is it.