My HP ZV600 Pavillion laptop has developed a screen fault. I now get only lines and boxes..multi coloured. External monitor works fine. reinstalled drivers, updated drivers and also updated bios. Still have problem. Any ideas?
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Try plugging in an external monitor and see how the display shows on it. If the display is ok on the external then your LCD Screen is going bad. If it shows the same colors on the external monitor then your video graphics card has issues.
I suggest try to use an external monitor to see if the machine will display an output through the external display, if you have display to your external monitor, it means the LCD on your machine is not working.
This is a sign that your screen or your video card is going bad. to test which one you need to connect it to a second monitor and look for the lines. If there is lines on both it is your video card, if it is only on the laptop's screen then it is the screen.
This will be a problem with either the screen inverter or screen backlight. You will need to take it to a shop for diagnosis, in order to find out which one it is. If it turns out to be the backlight, then the entire screen will have to be replaced. They are considered a sealed unit, and the backlight can't be changed out.