Yes your idea about it being the first 10 minutes is possibly on the mark. It's still not totally certain.
But it is true that there are noticablely large intervals of time during which this laptop is just as quiet as before.
It may be that these noises revovle around re-logging in and/or inserting a CD or DVD into the drive.
Since I'm at a stand-still doing audio with Vista anyways, it's difficult to test the laptop at all.
When the drivers arrive that allow me to use Vista with audio, I'll test my laptop by letting it rest with the power off for at least 45 minutes before recording. Then I'll give it 5 to 10 minutes after booting to let the laptop settle. Than I'll record and see what happens.
Many Thanks for your responses.