Thanks.! this is the computer its a Dell Optiplex 755 I cannot seem to find the model name but I did find out its a LGA socket type, I just cannot find the list of cpu I can use for the mother boardNobody should laugh at you or make disparaging remarks at your very relevant question. Open the computer up and get the motheboard make and model number, it should be written somewhere on the board, and then go to the manufacturer's web site and see what CPU they recommend in the board specs. Having said that I would give the computer back and demand a refund. A computer without a CPU is only good as a door stop.