I'm assuming windows 10 is on the system.....
Please run the diagnostic tool to check the hardware on system by following steps below:
1. Power off system. Remove all peripherals (except AC adapter)
2. Power on system, quickly start tapping the F12 key continuously until you see Preparing one time boot menu in the top right corner of the screen. In Pre- boot menu, select diagnostic. After quick tests finished, select Hard drive and Thorough Test Mode. Report back any error code.
I tried following you f12 instruction but nothing happens. I’m beyond the dell screen but I can’t get to the work place. When I try to log on manually no logon on screen appears. What to do?
The diagnostic tool appears to rule out any possible hardware problem,now I suspect the system is experiencing some type of software or boot / startup problem. Try getting into Advanced Repair options again. When you see the loading symbol, turn off your computer using the Hard reset / Power button. Keep turning the computer on and off until you see your computer booting into Advance Repair option. It should only take a few reboots. If successful, select Troubleshoot, Advanced options and Startup Repair. This option should help fix problems that keep Windows from loading. If that option doesn't work, select Command Prompt, and then run the commands in the link below to fix the boot problem.