DroboPro not booting

Hi, I have an older DroboPro that will not boot, mount, or be recognized by Drobo Dashboard (latest version).

It only has the green power light on (no drive lights), with or without drives in it.

MacBook Pro will not recognize it via any connection method (USB, ethernet, FW 800)

Also, I cannot shut it down without unplugging it.

Thanks in advance for any advice!

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