I own a Dell Inspiron 15 5559. This problem has been going on for about 12 days or so now. Every once in a while my laptop will flicker these colors of purple, black, and white. It seems to have gotten a bit worse lately. Here is an example of my problem in this video. I have updated my drivers, and run a diagnostics program from the DELL site. All leaving me with nothing. Saying no problems were detected.
I do wonder if it's possible it could be an issue with my charger? I have been using a charger I had to order from amazon that didn't come with my laptop. I decided to order an extra one of the exact same to keep upstairs so I don't have to keep taking this charger everywhere with me. I'm not sure if that would be a cause or not.
Run the LCD built in self test (hold D through powerup). If you don't see the artifacts, it means the screen is OK.
In that case, check and/or replace the wiring harness that runs between the mainboard and display panel. If that doesn't solve the problem, replace the mainboard.
If you DO see the fault on the LCD test, replace the screen.
While a third-party charger has its drawbacks (won't charge the battery), it won't cause the video artifacts.
So I've done the LCD test and all seems to be good there, but the thing with the flickering is that it doesn't do it all the time, just once in a while. Lately it's gotten worse. Now every time it reboots or comes back from hibernate or the comes back from the display being turned, it'll flicker. Sometimes it lasts longer. It flickered for a couple minutes today/right near noon. Usually it lasts for a few seconds, and usually it flickers a few times, maybe 1-5 or so. Sometimes more. Was the worst near afternoon when it was about 16 times.
I've also run into an issue a while back. around the 5th or so, a few hours before midnight of the 6th when the flickering began.The computer will start up, or come back from hibernate, and it will be stuck on the dell logo without the loading/dots symbol. So I'll press the power button to turn the display off, and turn it back on, and usually it loads again. Sometimes I'll have to press it a few seconds longer.