Emax

Hi everyone....
I'm new to the group and just got an Emax II.......
The first few times I powered it up, everything was fine.  It checked
floppy and hard 
drive and then was ready to go.......I was able to select banks from
the hard drive.  
This time I powered-up and it goes from "checking floppy" to "loading
software" to 
"disk is not formatted" and blinks back and forth between "loading
software" and 
"disk is not formatted".
It didn't have a disk in it when I got it, and the first few times it
booted up fine.......(I 
assume from the hard drive) and then suddenly started trying to
boot-up from the 
floppy (which I don't have) and will go no further.
Can any of you experienced folks tell me what I've got here?
I don't get why it stopped blowing past the floppy check and booting
up from the 
hard drive and started doing this.
I'm afraid I got stuck with a faulty unit, and it's hard to believe
because this thing is 
in museum condition and was rarely used.
Any help would be greatly appreciated.
Thanks,
Dave