To resolve display issues on Dell laptops you need to run a video stress test. Follow the steps
to achieve this:
ØPress the start button and go to Dell SupportAssist.
ØAnd under this, choose ‘hardware checkup’.
ØAnd to begin to stress test, click on ‘stress’.
These steps will run a diagnostic of the issue and
will let you know the cause behind this problem. If you are having any kind of
problem then you can contact Dell technical support number to get professional help.
For more: Dell printer customer service