When you go back to boot up, and you get to the Dell screen, can you please start tapping the F8 key, that should bring you to a start up menu, where start in Safe Mode is an option. If you can get there, please go to Start, Run, and type in sfc /scannow, exactly as shown, with a space between the c and the /, then hit Enter. If you have any missing or damaged system files this should repair them.
When this has completed, please go to Start, Run, and type in MSCONFIG, then hit Enter. On the General tab, click on Diagnostic Startup, then reboot the PC. If you can get to the log in screen, then one of your startup programs is causing the problem. If not we'll have to look for something else.
Is there any kind of error message other than getting to the black screen? Is the screen completely blank or is the cursor next to something, a letter, or symbol?
Hope this helps.
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Can't boot from USB flash drive
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