Changing Shell due to power button not working

I have a ex4100, 4 bay NAS, and the power will not come on anymore. I have ordered a new shell and im hoping that I can just put the drives from the old shell over to the new shell and be up and running. Is this a realistic hope? anything special I need to do or know?

power supply is fine, but the unit wont turn on. so I have ordered another diskless unit, hoping to be able to just move disks over to new shell/unit