Hi Triggerfinger,
Just a final update, then I'm marking this thread off as solved. The laptop is working happily with no beeps at the moment and I've returned it to my friend. I told my friend that I'm not 100% sure that it had been fixed as it seemed to have been something lodged in the keyboard connector, but that it was behaving itself. I was then informed that the laptop had periods where it "didn't make any beeps at all" and that it started doing it at random times, sometimes going on for days and stopping for weeks... Oh joy! It might have helped if I'd had the info before now, and I'm beginning to think that this laptop is closely linked to the Omen...
Anyway, it's working at the moment and Kapersky found nothing, so I'm going to assume that it will be fine: thanks for all your help - your site's wonderful and I'm sure I'll be returning in the not-so-distant future.
Regards
Dave