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Win10 anniversary won't install on Lenovo E350 box

I've got a computer in with a failed HDD (tonnes of dodgy sectors). I replaced it with an SSD (128GB 850 PRO), and started Win10 anniversary 64-bit installation. Welcome to setup, partitioning, progress installing files, then reboot all as expected. However on reboot the drive light flickers for a while and the screen shows the manufacturer logo and the circular progress indicator, then goes blank and the drive light stops flickering (stays off). I've left it for at least an hour like that and I've restarted a clean install twice.

It gets a bit odder though. This machine shipped with Win8x so it should have the product key in UEFI. I'm installing in UEFI mode as well (CSM is disabled). Setup with anniversary edition acts like there is a product key in UEFI, however not when I run with Win10 RTM or Win81 RTM. I'm guessing that when anniversary edition (or some Win10 version after OEM) is installed, the product key in UEFI is altered so that an older version can't be installed with that key.

Which leaves me with the first problem of the blank screen on the second stage of setup.

One thing I've tried is to do shift+F10 during setup and run a full chkdsk (/f /v /r) on the SSD, which showed. I did also start a memtest86 cycle but I didn't let that finish because I thought that installing with Win10 RTM was a better idea.

I'm going to try running the Win8 RTM setup in case the computer originally shipped with that (rather than Win81).
 
It's accepted the UEFI code for Win8 RTM setup, so fingers crossed it'll manage to install it, but if anyone has any ideas why Anniversary might have had problems and/or how to resolve that, I'd very much like to know!
 
Win8 RTM setup has worked. Now for the question of upgrading to anniversary, I hope I don't have to go to Win81 first...
 
Mikey, it was this exact reason I had to ditch windows 10 on my MSI CUBI. Both during the update and the anniversary install ISO it would sit there for hours doing nothing. Jumped it back to windows 8.
 
Because I made a silly assumption and didn't read the text, when presented with Win10 upgrade setup's "please enter a product key" prompt, I assumed it was because it didn't recognise the UEFI product key as valid and because I needed to upgrade from Win8 to Win81 first (long delay installing updates), then realised afterwards (as it said the same thing again). Win10 upgrade setup is still chewing through updates.

This machine has run Win10 before so it can't be a straight-up compatibility issue, though one thing I didn't try the first time around was to give the machine an Internet connection so the clean install setup of Win10 could pick up updates itself.

I've verified that the previous HDD had Win10 installed so I shouldn't end up with activation egg on my face.
 
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