I am trying to reinstall Windows 10 on an Asus X556LJ laptop, having replaced its failing HDD with a new, empty SSD drive. The laptop originally had Windows 10 preinstalled on it and I believe its motherboard contains Win10 key.
To achieve this I downloaded Windows 10 image from the official MS website and wrote it on a USB thumb using another laptop with Linux Mint (sadly, I have no other Windows PCs).
However, to my surprise, I am unable to boot the laptop in question with the said USB. It is not even listed in BIOS as a boot option!
I tried making sure if this laptop is capable of booting USBs at all, and the answer seems to be yes: it could boot from a Linux Mint LiveUSB. I also tried making sure if the Windows10 USB thumb is not faulty: I plugged it to this other Linux Mint laptop that had never had Windows10 installed and the USB was listed in the laptop's BIOS as a boot option, though booting into it deferred to HDD (I assume Windows security measures took off).
I should note this is the second time I'm trying to reinstall Windows10 on this computer due to failing HDD. The previous time I had the servicemen replace the HDD for me and afterwards I was successful in reinstalling Windows10; however, while I'm not certain, I have vague memories of failing to use USB that time as well and having to resort to DVDs.