What does a series of three beeps mean when my 2008 mac book pro is powered up?

I've just had this computer apart to repair the power supply cable (which I hard wired some time ago) and when I put it back together and turned it on I got no screen and repeated series of three beeps. Can someone tell me what that means?

http://support.apple.com/kb/HT5860?viewlocale=en_US

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