Macbook Air Loud Beeping!

Hi there,
I have become concerned lately, I have been finding that when I close my macbook air so that it goes on sleep, it will sound a fast and loud beep when it actually goes to sleep (not straight when the lid is closed). This is usually when it is plugged in.
However, sometimes when its not plugged in, and I may pick it up off a desk, or tilt it sideways to find the USB port, it will also make this loud beep. It's a little embarrassing in lectures!
Is there a problem with my hard drive or something? I have gone into utilities and used the disk utility to check my hard drive status, and it just says OK.
It never used to do this when I first bought this in Feb/March!
Any ideas?

Hi LeonJ,
A beep of any sort, outside of a POST chime on startup (which is more of a chime, than a beep) is not normal. There are diagnostic "beeps" built into the EFI firmware of Intel-based Apple computers used for diagnostics of component failure. Although typically the beep is on startup, not on sleep or shutdown.
Whereas Pappy's issue sounds more inline with when the beep should occur. Here are a few articles on some of the noise/LED-based diagnostics for the MacBook Air. But as iSMH previously identified, a service call might be the best solution. Even if it's a phone call into support for initial diagnosis.
Article 1 - http://support.apple.com/kb/HT1221
Article 2 - http://support.apple.com/kb/HT2130
Article 3 - http://support.apple.com/kb/HT1547

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