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#21
For the most definitive test, I would reset the BIOS to prior settings and just physically take out or disconnect Disk 0 and then reconnect the cable to Disk 3 or move Disk 3 into the bay and connect where Disk 0 was. Boot it up. Latest builds of Windows 10 have been finicky in that regard. There should be no risk in this as long as you don't drop Disk 0 or zap it with a magnet.
There ARE other paths you can take but this will be the most direct for the moment.
If boot doesn't work, you can boot from Macrium Rescue USB/CD/DVD to fix boot problems. Ultimately, you can swap Disk 0 back inline if all fails and we can advise you on another approach.