So I bought this laptop without an SSD because I already had the samsung 850 500gb mSATA SSD. I installed the SSD and everything seemed fine since the PC recognized the SSD. I wanted to install a different version of windows on the SSD by using a bootable USB. The problem is there is no other option to boot from the BIOS except for the default HDD of the laptop. I couldn't select either the USB or the SSD to boot although they both work fine. I tried the USB on another PC and it is still bootable. Can anybody help me?