Look under Main. Is the drive physically installed?

What model system?

If you have not run the Dell diagnostics (F12 at powerup), it's time to do that.

You may also use the "Get Help Now" option at the bottom right to chat with a Dell technician right away.

Yes it is showing in the main and i've tried all the possible diagnostics. Including thorough diagnostics. @ejn63 

Did you make any changes to the system - either manually, or install updates (Windows or in particular a BIOS update) between the last time it booted and now?

Or did the issue appear suddenly?

I repairing it from recovery when it showed BSOD. After repairing it showed an endless black screen and I guess that's when the 'No boot device' started @ejn63 

It's not booting to windows at all. It just shows dell then

Checking media presence...

No media present....

Then loads 'No boot device Found' @ejn63 

There is some information that may help here

https://www.dell.com/support/article/en-us/sln300987/how-to-repair-the-efi-bootloader-on-a-gpt-hdd-for-windows-7-8-8-1-and-10-on-your-dell-pc?lang=en

You're going to need to boot the system from a Windows 10 installer flash drive to attempt repair (and since it may in fact be impossible to repair the system, a reinstallation may well be required - which in turn will require the install media).

If you don't have that, you can prepare a set:

https://www.dell.com/support/article/en-us/sln297920/reset-or-reinstall-windows-10-on-your-dell-computer?lang=en

The problem is that the UEFI boot loader needs to be rebuilt, either manually (see the first link I posted) or by reloading Windows (the second link).

Until that's rebuilt, the system won't find a bootable drive.

To boot from the flash drive, press F12 at powerup a couple of times, and select it from the boot menu that appears (if you do not see it as a bootable option, it was not made properly).

I tried using a hard disk that has the windows image but it still gives the same error. When I plugged it in I checked the boot menu and the drive wasn't showing in the UEFI sequence. I really don't know what's going on anymore. @ejn63 

How are we supposed to do that when USB doesnt even show up in Boot prioirty list.

It shows only IPv4 and IPv6