Why is my screen white?

My iBook G4 is very old and has not been used in about 10-15 years. It powers up, chimes, noise can be heard from the volume buttons and the caps lock light works. However it displays only a white/grey color across the whole screen which seems to be the only problem. I have read that this can happen when the LVDS (video) cable is disconnected from the LCD panel and if anyone would recommend trying to re-plug it back in. Thanks