3 loud beeps when I try to start MacBook Pro

Backed up my MacBook pro running snow leopard.  trashed a bunch of old files.  everything was running fine.
I shut down and restarted.
It makes the tone but no apple icon.  Then three  loud beeps over and over.  Sounds scary.
Never had this before.  What does it mean?  It sounds serious.
Thank you,,
Patrice

Hi Patrice,
That usually indicates a problem with RAM.
Try troubleshootingthe RAM. Shut down. Disconnect power adapter and remove battery. If the RAM youhave installed is not the RAM provided by Apple, remove that RAM and installthe Apple-supplied RAM. If you don't have the Apple-supplied RAM, or youalready have the Apple-supplied RAM installed, remove one module, try booting,move that module to the other slot, try booting, repeat with other module.
Ifneither RAM module works in either slot, then there are almost certainly otherhardware issues (usually the logic board, which covers a plethora ofpossibilities; unfortunately, the fix for almost any LB issue is to replace theentire LB), as the odds of both RAM modules and/or both slots being faulty areextremely low (but possible).

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