I have an HP laptop dv4-2145dx. THe pin inside the charger connector broke off after it was bent. I purchased a new replacement on line (not an HP cable). It is an output of 19V 4.74 A. When I pug it into the computer, the light where you plug it in lights up and the lightning bolt on the front lights up. When I turn the computer on, other lights such as the wireless light and the sound lights come on and the power light comes on. But the screen doesn't come on, the lights for the charger, caps lock and the scroll lock all blink. When I shut the laptop down the light for the charger stays on constant. Any ideas why this is happening?