5C not restarting after sleep

On my MacBook pro

Got improper dismount warning from 5C upon wake from sleep (old Gen 3 fine)

the drobo is not seen by Dashboard

I shut down computer-rebooted-still no 5C

shutdown computer checked connections, restarted computer and powered up 5C

all five drive lights lit yellow, green power light on, blue lights did the run to center as usual on restart–it stopped there, drive lights off, no blue lights, green power light on