And depending on who made the BIOS it varies in what it means.
You can look here for a full explanation of the Different Makers Beep Codes but you will need to read your POST Screen to see who makes the BIOS Award, AMI or Phoenix are the main suppliers but depending on who made your M'Board or who it was made for the Maker could be different. For Instance IBM and Apple have their Own BIOS's so you would have to know what you have to start with.
http://www.computerhope.com/beep.htmCol