Just formatting doesn't clean off any disk signatures which is why I always use the 'clean' option in diskpart.That would be time consuming for me, I've never used DOS prompt and I have very little experience with Diskpart, I would have to teach myself how to do that.
It's not that important that W10 work on that machine anyway, but I still may mess a round with it.
Right now it has a hybrid SSD/Standard Seagate drive in it, it may be failing, but I can't see that happening.
The MoBo is running an Intel processor so the best thing that I can do is get the chipset driver from them.
When I do a clean install I usually pull the drive an hook it up to another computer.
From there I go into disc management and delete all what's on the drive creating unallocated space.
I then leave it like that and let the install disc automatically format the drive when installing the OS.
As to the drive, it's quite possible it may be failing or have issues, Seagate are notorious for faulty drives (we stopped using them after getting over 30% failure rate), and I hate the hybrid drives (actually this could be what causes your system to suddenly ramp up as it stores stuff in the cache then cleans it down when he system is idle)