New
#11
It is very late here so I will revisit this in the morning but here are my thoughts for now:
I think you are saying I should proceed with a fresh install of Win10 on the 750 GB HDD to make the computer work, then use HDtune &/or Hard Disc Sentinel to test their original HDD.
I know how to install Win10 with the Media Creation Tool and I have the product key so that part is straightforward.
I guess I'll need to connect their original HDD to their computer with the "new" HDD in order to test it. I've had computers with 2 hard drives in the past but I've never done it myself; Is it as simple as plugging it in and turning on the computer or do I have to do something to make it not try to boot from that HDD (I have a vague memory of my son mentioning jumpers to make one the master and the other the slave but it was a long time ago and I have no idea if that has changed since then).
As for backups, I have a couple of ideas about that but lets get it working first.