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The sound is the same as the one you hear when you plug in and unplug a USB device. It beeps when I approach the laptop and leave it and also sometimes when I move in front of it. This is an ASUS, model G73JH.

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Possibly there's some software involved doing facial recognition on the webcam to enable/disable functionality of the machine if a user isn't present? I know new ThinkPads have an app that'll lock the machine down if you walk away. –  Shinrai May 26 '11 at 19:47
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What you are experiencing is the ASUS SmartLogon feature. It is a facial recognition feature that logs in for you and logs out automatically.

Here is the link to the ASUS SmartLogon user guide:

ftp://ftp.asus.com.tw/pub/asus/nb/U6/ASUS_SmartLogon_UserGuide_VT_EN_V1.pdf

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Looks like I'm a good guesser. –  Shinrai May 26 '11 at 20:05
    
I can't believe the folks at Asus did know about this. The strange thing is that when I disconnected my logitech trackman wheel mouse the sound stops. Also when I replace that mouse with a another similar mouse I have no beeps. –  Tom May 28 '11 at 4:38
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