From what I've read, formatting the HD and reinstalling Win10 does the trick, and for those of us who didn't get a paper user guide with their IdeaPad, the license key is built into the Bios so that's no problem. However....
Here's my adventure:
After re-learning how to format the HD via command prompt (last time I had to do that was during WinXP days) I formatted the drive, then attempted to reinstall Win10 via USB. I got an error message that it could not be installed on an MRB hd, only a GPT
hd system.
Next step, I found out how I could convert from MRB to GPT which is a relatively simple process if you can bring up a command prompt, which now I couldn't because I've lost my mouse and touchpad access (because of the formatting??).
I did some more research and decided that using WinPE would probably help me, so then I had to learn how to make a bootable USB with which to use WinPE, and in the process it seems that it would be even more helpful if I partitioned the USB so I could store
a couple other helpful programs.
Somewhere along the way I read that I should be sure to use a USB 3.0 but nowhere on my 2 empty USB drives did it say 3.0, and after researching yet again found that there was no 100% way to visually be sure of the USB version BUT there was yet another nifty
little program that would tell me so that's when I discovered they were USB 2.0.
At that point I decided it would be a better idea to go out an pick up a new thumb drive the next day and have some whiskey instead. All this to save the $80 (that I didn't have anyway) my local computer repair shop would charge to load Win10 for me.
The next day I went out and bought a new thumb drive. It was a 2-pack on sale and money was very short. The store clerk looked it up on the manufacturers' website but it didn't say if it was 3.0. She was sure it must be, though, so I bought it. Went home
and checked with the SKU and it was 2.0. Went back out, stopped at a different store and found a 3.0 on sale for $2 less, then returned the other. Came home and opted for whiskey again.
Since my IdeaPad isn't used very often anyway, I put the whole darned thing on the back burner for a couple of weeks and I'm just now getting back to it. Of course I don't remember half of what I 'learned' but thankfully saved bookmarks.... still, since
the "Murphy's Law" of computers tends to kick in on a regular basis, I've prepared myself emotionally to deal with what comes my way LOL. If all else fails, there's whiskey! (partially joking :o) ).
I don't know if any of this information is useful to anyone, but hopefully it will at least give you a chuckle.