This may not be the case for you, but it might help.
I ran across a computer that was rebooting itself. Come to find out, the capacitors on the MB was leaking. I know you have a laptop but you might want to check into it.
I also have a Sat Pro. Mine makes the same noise probably twice a month. However, after about 5 seconds it quits and it seems it only happens when I come out of standby.
If you update your bios, be very careful. If your system stops (freezes) during upgrade, this is very bad. I would go to the extreme of putting it on UPS before upgrading. If you mess it up, you looking at buying a new MotherBoard.
[pipe]
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