Hello Nickz93, I do understand the inconvenience you have faced and I will be more than glad to assist you.
My suggestion for this kind of behavior is to connect the SSD to the computer where you set up the encryption and delete or disable the password. Have you tried that?
The reason why the SSD cannot be use on the new motherboard could be related to the chipset of the board.
Also make sure the SSD is connected to the SATA port 0.
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Encryption failed when the system components were moved to a new casing.
Same hardware components, except for new video card installed.
1. Used the old video card
2. Plugged the SSD to SATA port with Intel Controller resolved the issue.
Marvell - Gray SATA ports
Intel - Blue/Black SATA ports
When the system was transferred to the new casing, SSD was mistakenly plugged to the SATA port using Marvell Controllers - Gray SATA port.
This is posted as reference for users experiencing the same issue.