Beeps in macbook after installing snow leopard

Hello, first, sorry for my english, last Friday I got snow leopard uptodate, after successfully install, the system may be restart, and then the screen goes black emitting several beeps.
if I turn the computer off and on again, snow leopard boot properly installed. I tried to reinstall it twice and both times gave me the same error.
10 days ago I expanded the macbook to 4gb ram.
Thank you very much

I agree with Jay, it sounds like a RAM problem. Exactly how many beeps are there? Here is Apple's article about startup beeps:
http://support.apple.com/kb/HT1547
Also in Spanish:
http://support.apple.com/kb/HT1547?viewlocale=es_ES
I would try to put the old RAM in and see if you have the same problem. If not, then you have bad RAM whether or not you're plugged in to electricity.
-Doug

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