Macbook Pro, builtin iSight, can't record sound

Question

I load up iMovie HD, make a new project, choose the "Built-in iSight" from the camera pulldown. I can successfully record video, but it does not record audio through my built in mic. I can conclude one of the following problems
1) Due to being completely inexperienced with my laptop and mac products in general, I have little clue what I am doing and just need some direction
or
2) I have a hardware error
I am going to assume question one and request some help from all you guys.

Answer 1

i'm aware of my other audio interface options, but i would expact this machine to have the basic options every 20 year old pc has, a simple plug and play difault to get audio into my computer. i bought it at b and h in NY and in their specs it says that it's a 'combo kack' - meaning both in and out analog audio ports. after cheaking mac's site it says only headphones.
also tryied to connect a digidesign mini mbox2, through the usb port, and i had to unplug it, shut down the mbp, restart it again etc.. and it also doesn't always work propely and makes all kinds of digital error sounds.
although in this case i can't that the mbox is not damaged.
over all it's very dissapointing. it's my first mac and i figured it would be a much more idiot proof, user freindly work tool.
if you got any other tips i'd appreciate that
thanx alot for the focusrite link