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Switch ON the system and switch OFF the system 3 to 4 times when the Dell logo appears. This will make the system to go into ‘Windows 8.1 Advanced Startup Options’ screen. Please select Troubleshoot option and choose the REFRESH option so that it refreshes the windows operating system.
Also, I would suggest that you run the diagnostics on the computer by following the steps mentioned in the video below and check if there is any issue with the hardware on your system.
Please let me know the findings.