Need to install an OS and I can't

Sep 4, 2018
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I bought a new empty Toshiba Hard Dirve. The problem is that everytime I try to install the iso, the pc wont recognize de bootable USB or DVD, i have tried both in a laptop and they work, it starts installing but on the Pc where I want to mount it, doesn`t.

I don't think is necessary to mention it but, the Pc obviously doesn't have any os, so I can only acces it BIOS and before you ask, the BIOS does recognize de hard drive, the usb and the disk when they are connected but when it leaves the BIOS it doesn`t start the installation of the OS.

The message that appears is "Boot disk not detected or the disk has failed"

Edit: I have the DVD in the first position in the Boot Order already.
2º Edit: I solved it. I disabled Safe Boot and abled Heritage, restarted and it finally worked.