Loud beep sound when starting up my Mac book air (2007), right before the classic start-up noise

There is a very loud beep right before the classic Mac start up "bong"
I'm thinking there might be something wrong with the ram...
Any answers? Thanks!

Although it's an older article, for the most part it's applicable -
http://support.apple.com/kb/HT2538
The beep on startup is usually an indication of a failed RAM module. It's also possible that a recent firmware update on the machine was botched. If you didn't recently perform a firmware update then it's probably the RAM. As the RAM is soldered directly to the logic board it cannot be replaced individually, it'd require a full logic board replacement.
Given the age of the machine, it's unlikely still covered by the AppleCare Protection Plan and definitely not the one year limited warranty.
The next course of action would be to bring the machine into the Genius Bar or AASP and have them evaulate your repair options.

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