Why my mac beeps 2 short beeps ?

Why my mac beeps 2 short beeps , it happens once or twice or maybe more a day ? Is that means there is a problem with it ?

Perhaps SMC and PRAM resets will help:
http://support.apple.com/kb/ht3964
http://support.apple.com/kb/ht1379
I view that as an 'undesirable' noise.  If the above does not eliminate it, my prior suggestion of an Apple Genius bar or AASP appointment is the best option.
Ciao.

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