Well im having the same problem as you are but i have a toshiba satellite L505-13v and running windows 7 home premium so im not sure if this going to help you or not.
I searched for this problem and i found that it might have something to do with the battery or the charger im using.
I have a Toshiba Satellite Model U305-S5077 running Vista Home Premium. Now and then it will beep randomly for one second or so. It doesn't do this at startup. I bought the computer last October and probably have heard this only a few times. But should I be hearing it at all? Does it have anything to do with overheating (the noteboook hasn't shut off but I've used it for hours at a time).
Is it a genuine problem, or a quirk of Toshiba?
Any guidance you could give would help. I went to the Toshiba website and Asked IRIS and IRIS couldn't or wouldn't come up with an answer....just gave me a bunch of matches for "beep" and "randomly" that didn't explain.
Thanks for any assistance or explanations any of you may have.