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What to do in this case, depends partly upon the exact error message(s) shown for each failure, and upon whether by 'try to turn Off the RAID', you mean either turn Off the power switch, or disable the RAID arraying.
I presume that you mean disabling RAID arraying. The next question is, what level of RAID? simple disk mirroring or duplication of data across drives?
And then there's the question of whether you have Windows on the drive(s), or some other OS like Linux, Windows Server, etc., and of what version.
Also, with what software did you set up the RAID array, and is it the same software you are trying to disable the RAID array with, or different?
Let me know more details, and I will advise you as appropriate.