Drobo 5dt will not turn on

My unit will not turn on after a sudden power failure. The power brick still has a solid green light but the drobo still will not power on.

Any suggestions on what to do?

I still have my old 5C is it feasible to move the drives back to that model. I don’t want to lose my data.

Green light on the power brick means nothing, or at least nothing useful, try a substitute.

No you can’t migrate back to a 5C from that, you might cross check the rating of the power brick though, fair chance you could borrow that from the 5C for testing purposes.