Black screen F12 key has red light.

Need help. Did a backup like the system asked for. Shut my PC down but when I went to go in to check my emails it wouldn't start up .It just has a black screen and the F12 key stays red.

Hi Poshbird8:
Thank you for your inquiry. I will do my best to assist you!
When posting it is most helpful if you include the exact model of computer and the operating system you are running.
I understand that you are getting a Boot Manager missing error on startup.
Here is a link to a document on "Computer Does Not Start and the LEDs Blink or the Computer Beeps" click here. If you would like further assistance please reply back with the information requested, and any results from your troubleshooting efforts.
Sparkles1
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!

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Regards,
DP-K
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Black screen F12 key has red light.

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