Sound specialists,help appreciated.

Audacity does not record anything in
my computer(iMac first generation 1998,
built-in microphone,running Debian Linux
3.1 PPC).When I open Audacity,I receive the
following warning:
"There was an error initializing the Audio
I/O layer.You will not be able to record or
play any sound.".
The pop-up menu where we choose Mic,CD,Line-
in etc. for choosing the input device does not
react.
The interface works normally but the graph
of the record is a horizontal blue line
in the zero score of the vertical scale,
in the audacity interface.(Logical)
The program installs OK and nearly all the
interface of the program works OK.
In the Preferences dialog the recording
device is shown as /dev/dsp.
What can be wrong here?The computer devices
(sound card,built-in microphone, etc.),or
Debian3.1?

When Debian initializes I see:

Setting up ALSA...
All modules loaded.

Ardour-gtk also does not work,it complains
that it cannot connect to Jack,however Jack
is installed with the Debian tool aptitude.

Another question : Does Debian recognize
external USB microphones?What brands? That´s
the only way for my iMac to have high quality
micros.

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