Hp pavilion g6 Black screen [Closed]

Registration date
Tuesday August 9, 2016
Last seen
August 9, 2016
I have an hp pavilion g6. When I turn on the pc it all works I can tell but the screen is black and no sound. I tried hooking to external monitor with vga and hdmi but didn't work. Now the thing is I took the hdd out and hooked it to my desktop and it worked just fine. Then I took another hdd and hooked it to the laptop and the screen worked but it kept restarting. So with the original hdd the screen won't work but it does work I don't get it help. Oh and it is running windows 7.