I have a 20 months old HP G62 225ca laptop that have a strange problem. At anytime, the screen can turn completely white and stays white until I close the screen and reopen it. The problem happens more frequently when the laptop work on the batteries. Also, the computer is still perfectly working when the screen is white. I can plug it on and external screen and continue working on it as nothing has happened.
I would argue that the laptop somehow has difficulty to provide enough power to the screen. However, I do not know how I could correct the problem. I have searched for solution from HP website, but the troubleshooting area is very limited. I wasn't able to find anyone describing the same problem on Google.
I completely unmounted the laptop and did not find any evidence that one of the part has burned or broken. Also, the laptop now more frequently turn to grey screen. Other problems have arisen that may or may not be connected to this issue. Sometime the usb ports don't work, other time connecting the laptop to a tv is impossible (the laptop detect the tv, but no images are sent). It further consolidate my opinion about a problem of power distribution. I, however, have absolutely no idea how it could be corrected.