Reboot and select proper Boot device Or insert boot media in selected boot device and press a key

[Windows 10]

Hello, ive been trying to clean install my computer for a **** now using a flash drive. My first problem was the partitions. I used the cmnd prompt and use diskchck and clean disks 1,2 and 3. Then i boot up my computer with or without the flash and it gives me the “Reboot and select proper Boot device Or insert boot media in selected boot device and press a key”. Ive tried going into bios looking at other tutorials and it just wont work. I use a Gigabyte ga-a320m-s2h motherboard. I am also not very familiar with this and this is my first time with any of this

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