Solved! Display error on dell vostro 3450

[chiasmcross]

my laptop screen just turns all black and white pixels after a while of using. and i turn off the lid and turn on the lid it works fine and after an hour or 2 same thing again. i uninstalled and instaled my display driver, updated it but the same issue persists.

 

[webworkings]

Well, it could be the cable that connects the display, the display itself, or even the GPU.

If the device is under warranty, I would contact the manufacturer. If it isn't, you can try connecting an external display and see if the problem happens on it as well. If it doesn't, then I would be looking at the cable and/or the display. However if it shows up on the external screen, then it is more likely the GPU.