Can't record voice-over...

Question

I am trying to record a voice-over and seem to have a harder time than expected... I have done it in the past on the same machine but seem unable to repeat it.
Anyhow, here's how it goes: PP 5.5 on a 2011 iMac. My external lapel mic is dead so I want to use the internal mic. The internal mic seems to work fine (Finder Preferences shows the sound recording levels go in the max region).
When I try to select the audio hardware in PP (Preferences>>Audio Hardware), I am stuck with "System default input/output", even when I choose "built-in mic/built-in output". I can select "Built-in input/Built-in output" but that's not what I am looking for (I think).
Anyhow, back to the Audio mixer, I select my audio track for recording and only have one hardware choice: "Built-in input: Line 1/Built-in output: Line 2"
Of course (?) when I try to record anything with these settings, the recorded track is empty.
What gives?

Answer 1

Eureka!
I finally got it (using the built-in mic, which is of course not the best solution).
For those interested, here is how it goes.
First, you have to pause when reading this link: the "Utilities" mentioned there is not a hidden menu somewhere in PP, it is the Utilities subfolder of the Applications folder on your Mac, in which there is, indeed, an Audio Midi Setup application. Here is how it looks on my iMac (Lion OS) after I selected the Built-in microphone:
I didn't change any of the default settings.
The point is that once back in PP and after having selected built-in mic in the Preferences>>Audio Hardware pull-down menu, selecting this in the Audio mixer in PP worked out fine.
Note that I discovered this by chance, looking ahead for what I would have to do once I had purchased a USB mic...