RE: Screen turns black every few seconds for a short while
I suggest you to test the system in safe mode or BIOS to see if the same issue occurs again. Also recommend to update to the latest BIOS and graphics drivers and observe the system.
Here is a detailed troubleshooting guide for the graphics issues:
If the issue still occurs , please contact our Dell Egypt support for further assistance. You should be able to find the contact information from the link below: