You can download the manual from Dell and that should tell you what the beeping code is and what the failure should be.
**EDIT***
Did it for you
Quote:
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Four beeps — RAM Read/Write failure
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Depending on your configuration its about $13-$20 per gig of RAM for that, depending what you buy or if you want
2 x 1GB
4 x 1GB
2 x 2GB
4 x 2GB
Those are the amounts you can add