Weird. I disabled Secure Boot (in the BIOS) and Fast Boot (in Windows 10), and then installed Linux Mint from an external HDD (connected through a SATA USB-HDD cable) onto my computer. The odd thing is, is that I get 'No bootable device' when I turn on the computer. EFI/Legacy boot just throws the same error, also when booting off the USB it does the same thing. Any solution?