Hello and welcome to justanswer, My name is ***** ***** will be assisting you today,
I'm sorry about the issue, Please follow the steps below and let me know the results :
1-If you have a USB3 port or/and Thunderbolt the Drobo Dashboard must be installed.
2-Make sure your data cable (USB, Thunderbolt, FireWire, eSATA or iSCSI) is properly and firmly connected on both ends. Try a different cable.
3-Try connecting to a different data port on your computer.
·If connected to a USB hub, power down Drobo and directly attach the Drobo to a data port on your computer.
·If using daisy chain configuration on Thunderbolt or Firewire, power down the Drobo remove daisy chain and try again.
Now Reboot Drobo and the Computer as follows:
1.ProperlyShutdown the Drobo (because you don't have access to Drobo Dashboard).
2.Reconnect the power cord.
3.Restart your computer.
4.When the reboot is complete, reconnect the data cable to Drobo*.
5.Launch Drobo Dashboard, wait for dashboard discovery.
If you need further help please reply back to me