I took the 120gb ssd out of the failed clean install pc, and made a copy of the W10 9926 in the upgrade machine. So the upgrade machine has the ssd. I formatted the 250gb hdd out of the upgrade and fitted it to the failed clean install and Windows could not see the drive. The bios could ok. I had a 60gb ssd which Windows could see and 9926 has installed. All in one day, there have been 9 failures to install Nvidia and 3 failures with Silicone image, 10 and 4 were sucessful. I wonder if these were power related, I set power options in control panel to 5 hours both but I've just found "settings---system---power options" which were still at 5 hours and 15 minutes. Bythe way, I used Mini Tool Partition Manager version 9 which makes it very easy to migrate the OS between drives.
In reply to an earlier question from Slartybart which I forgot to answer. I actually made three copies of the ISO. The first two were from the same download, one on a dvd-r and the other on a dvdrw they were different sizes probably due to differences in formatting. I downloaded the ISO on another pc and made another dvd-r which had exactly the same number of bytes, 4303388672 as opposed to 4206886912 for the dvdrw. I needed to be sure that the ISO/media that I was using was not the cause of my troubles.
I'll have to read more of the thread, but want to post this :
DVD-RW might cause some problems - only use DVD-R discs.
DVD-RW is hit or miss ... depends on the writing software / hardware and the reading device. If it's the same device, there might still be issues. Stick with DVD-R discs or use a flash drive (4 GB should be big enough - 8 GB more enough) There are some flash drives that say they're 4 GB but fail writing slightly less than 4GB. If you try a Flash drive and have trouble, try another flash drive.
I've just got the upgrade pc to 9926 in the last hour and without having to re-login to W10 forums. I will have to change to a larger drive as the 80 gb I am using has only got 4 gb free. Funny thing was, I fancied that I could hdd noises when I was convinced that I was using an ssd. Seeing 80 gb in my pc proved that it was an old WD that I bought on ebay. I have a spare 120 gb ssd to use.
Girl: I am looking for hot lips and seven kisses
Guy: I have only 2 balls and seven inches
Girl: Is this a record ?
Guy: It may not be a record but it is a damn good average
Upgrade pc is now running from the 120gb ssd.