Hp Presario Cpu Upgrading Problems

My HP presario cq56's monitor is not turning on whenever i recently upgraded my cpu from a 2.0 ghz single core intel celeron T3500 to a 2.8ghz dual core intel T9600. Whenever i turn it on the fan and the LED lights for the wifi and caps lock come on for a second and then turns off and back on again all while the monitor screen is black and not changing.