Greetings,
This is both a request for some additional brain power as well as a kind of how-to as to what I have done and it worked so far...
1- BIOS install legacy device v. UEFI.
There are two things I have done and you will need to do if you want to use other devices
- disable Secure boot
- enable CSM
Then you can use any device to boot from or install from. Apparently if you do this to setup you have to leave it so (as far as I know, putting back defaults causes a bios loop) you can boot from your new hardware/software setup.
Ok that aside, and having done this step - I have installed Windows 7 Ultimate on a spare HD that I put in place of the SSD (and removed the other drive as a data safety precaution - and then activated that with success, and followed that up with an upgrade to Windows 10 Pro.
I have checked the 10 Pro activation and it is both active and the cmd line check states its permanently active - so it's registered my hardware as 10 Pro 64 on the MS servers. All good.
Now I have a two step method here and why I did this on a spare HD - understanding that there are still some odd bits going on with 10 on the G751 - I want to check all the drivers and functions on the spare HD OD setup first and it all checks out (for what I need).
Then the next step once I have smoothed out the settings and all that is to revert to the SSD and original disk HD setup (which is still running 8.1 Home) and install 10 on that.
Since I have registered the hardware with the Win7 Ultimate setup I believe (question here) that I can now just do a completely clean install on the SSD and wipe that and then install 10 and it should then activate due to the register entry.
Is there any issue anyone can see doing this - it looks good so far, so the step would be
1. check the spare setup - good to go - proceed.
2. Wipe the SSD and install that, then do a clean install on it new partitions and fresh install
3. Connect to the net and activate and update any updates
3. Install Apps and call it a day, get pizza and guzzle coffee.