I am using a HP ProBook 4510s and am having problems with the display.
On power up the display is shaded by a green/yellow overscreen which eventually disappears when operational.
The display also moves between an excellent display to not so good.
The display is perfect when used with a televison as the monitor.
Is the display panel the problem or could it be the graphics card on the way out?
Just a tip.....sometimes a failing backlight tube will cast a funny color on the screen. Back in the day, Compaq's and HP's that had a worn out tube would have a red tint to the screen, that would slowly disappear after about 60 seconds when the tube warmed up.