Halt in start up

I restarted my host machine and noticed my drobo turned off as well. I thought it was odd but I turned it back on using the toggle in the back. It goes through the normal boot process and then nothing. The drive light indicators do not come on, the only thing that is on is the yellow power light and the power light which is suppoesed to mean the start up is on process. Drobo never appears in the drives section of Windows or the Dobo dashboard. I know this unit has been discontinued but I am stumped. It has worked fauless and then nothing. Any suggestions would be helpful