Hi. I have come across a weird problem. I bought a HP x360. And my plan was to install fresh win 8.1 on a ssd. Problem is the machine will not detect the ssd (I checked and it works). I install the iso on usb and boot. Cannot find disk. Run diskpart and get "no disk detected" (other than usb). I connect the ssd to another machine run diskpart with clean all and create GPT As a test I cloned the drive with paragon and still it could not find the disk. I was able to use "upgrade windows 8.1 with a key" to create usb and install the ssd with the usb. So I know the drive works! But I only have a win 8 pro key, so I cannot activate the core oem key from the bios. None of the core keys I found on the web works to create the usb. So what gives that when I create usb from "upgrade windows 8.1 with a key" it works but when I use iso from this forum link or the enterprise evaluation from ms website or even clone with paragon it does not recognize the disk in the bios? Bios contains "enable legacy", "secure boot" and "clear security keys" along with "load hp default security keys". I tried all permutations without success.