You will need the Windows 10 installation media for your version of Windows 10. If you do not have the installation media you can use the Media Creation Tool
to create Windows 10 installation media for a disc or flash drive.
There are three options, use the second option Using the tool to create installation media (USB flash drive, DVD, or ISO file) to install Windows 10 on different PC.
Follow the instructions and you should be good to go.
Place you installation media in the appropriate port or drive and restart the computer. You should see the message Press any key to continue, press any key. If you do not receive this message you may need to change the boot order in the BIOS. The first device in the boot order will be either be a disc drive for a installation disc or a USB port for installation media installed on a flash drive. The second devic in the boot order will be the SSD/Hdd.
When you see the Install Windows page tap/click on Repair your computer to start the Windows Recovery Environment.
In the Windows Recovery Environment you will see Choose an option screen, tap/click on
Tap/click on Advanced options, then select Startup Repair.
After running the Startup Repair restart the computer to see if this has resolved the problem.