Hi John.
I'm David, and I'm happy to help you.
Go into your computer's BIOS and see if the disk on which Windows is installed is being detected.
The procedure may be different on each computer. I suggest you consult your computer manual. Manufacturers usually make the manual available in the support area of their websites.
If the disk is being detected by the computer's BIOS, proceed with the procedures below.
You will need installation media to try to repair your Windows startup. If you don't have one, create using the Media Creation Tool. Access the link below and click on "Download tool now".
https://www.microsoft.com/software-download/win...
Run the tool on a functional computer and select "Create installation media for another computer".
You can create the installation media on an empty USB flash drive with at least 8GB.
With the installation media, try to repair Windows startup by following the steps below.
- Start your computer using the installation media;
- Choose your language, select "Next", and click "Repair your computer";
- On the Choose an option screen, select "Troubleshoot > Advanced options > Startup Repair".
If it doesn't solve the problem, do the following:
- Start your computer using the installation media;
- Choose your language, select "Next", and click "Repair your computer";
- On the Choose an option screen, select "Troubleshoot > Advanced options > Command Prompt".
At the Command Prompt, type the commands below one at a time and press Enter.
chkdsk /r /f x:
Bootrec /Scanos
Bootrec /Rebuildbcd
Bootrec /Fixmbr
Bootrec /Fixboot
Close Command Prompt and restart the PC.
I hope this helps. Feel free to ask back any questions.