Three beeps is defective memory. Your memory is failing the post RAM test. One last test would be to put the new memory where the old memeory was a turn it on. If it still beeps, you got bad RAM. If it works, you might have to read the manual to find out what the maximum RAM is and what flavors it takes. I've seen some say that max RAM is 4gb, but it can only do that with 2 2GB sticks.