Windows 10 in USB not working

Coolz wrote: So when I tried to put my USB with Windows 10 installed into my custom Pc, it shows a black screen that says, "Reboot and Select proper Boot device or Insert Boot Media in selected Boot device and press a key." Now, many of my friends have built their own Pc as well but none of them has come across this screen before. I would like some help so I can understand what is going on!

What mother board are you using?

What USB port did you use? That is, location of the port, on the PC case, or on the board's IO panel?

What type of USB port? USB 2.0 or 3.0?

What is the source of the "USB" (flash drive? "USB" is very ambiguous) with Windows 10? Sold with Windows 10 on it from MSoft? Created yourself? Or some other device?

If created yourself, how did you create it? What was the process?

We cannot begin to help without this information.

The message you received is a very basic and common one encountered when attempting to install any version of Windows. Either the "USB" media has a problem, or your USB connection is not active.

So when I tried to put my USB with Windows 10 installed into my custom Pc, it shows a black screen that says, "Reboot and Select proper Boot device or Insert Boot Media in selected Boot device and press a key." Now, many of my friends have built their own Pc as well but none of them has come across this screen before. I would like some help so I can understand what is going on!