it grinds to a start in the old HDD drive.
Does this mean that it does eventually successfully boot into Windows from the original hard drive?
In that case it may just be that the boot order has reverted to booting from the original drive. There are various ways to address that, there should be an option shown to choose boot order when the system starts up, maybe F9 or F12, you could enter the BIOS setup and review the boot device priority, or you could temporarily disconnect the old hard drive and see if that makes the system boot from the SSD.
A flat CMOS backup battery can make a system forget its boot order.
Otherwise the info requested by hamluis will be useful.
Edited by Platypus, 10 June 2018 - 08:08 AM.