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How to set up BIOS from a hard drive

I have recently finished my custom PC build but I cannot seem to do right BIOS setup. I am not re downloading windows. Instead I am taking my old hard drive that already has Windows and plugging that into my new PC build. In fact, my BIOS screen shows that it detects the HDD. Is there a way for my motherboard to boot right into my old hard drive’s Windows download?

I looked everywhere online to see for a BIOS setup similar to my situation, but cannot find it. Also, I have already set the hard drive with Windows 10 as the first priority in the boot sequence, but still my Windows is not loading and the computer just automatically goes to the BIOS screen instead of a normal Windows startup.

Thanks for the help.