my guess is that the connection from the screen to the lower half is loose, hence you were having to use the laptop at an angle because it wasn't completely loose. I would recommend you trying to connect the laptop to a monitor, or tv via the vga port as a temp solution and to make sure that it entirely is the monitor; i would recommend you take the laptop apart from the bottom and look for a connector around the big circuit board that looks like it came from the monitor portion of the laptop