whats this ? pc keeps making noise

2primo

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my pc keeps making a noise like when you plug a usb flash drive in
its strange coz i have nothing usb currently plugged in !!
is there a log or any way i can find out what / why i keep hearing this noise
pc is not on a network and not wireless

any ideas please
 
My netbook does this when there is nothing attached.

Some of the hardware internally shows up as a USB device, when it powers down or the netbook goes into power save, I get the disconnect tone. When it powers back up I get the connect tone.
 
do you have a card reader built in? sometimes when you start up apps they recognise an internal card reader which makes the usb type dings...
 
Does it have built in bluetooth? On some of them it has a powersave mode so you get that annoying dum-dum noise
 
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