Well, when a computer beeps endlessly and doesnt make it to post, it is definitely the ram that has a problem.
As you mentioned you've already tried to diagnose the problem by swapping the ram but have you tried the same ram in different slots? Its possible you damaged the ram slot on the motherboard.
For further ram diagnostic instructions you could always try here:
http://www.technibble.com/how-to-diagnose-bad-ram/