milasir

I have an HP ZV5000 laptop. I recently sent it to be fixed because the a/c power jack wasn't working and the computer wasn't charging. After I received it back, you can see the light from the computer screen but other than that the screen is black when I startup the computer. You can hear all the normal noises that it makes when it is starting up but the screen is just black and stays that way. Nothing happens. However, like I said, the screen is lit. There is no text and no cursor on the screen, either. It is a blank black screen. Does anyone have any ideas what the problem could be? Thanks.