Powerconnect 3348 stuck at Stand Alone

Hi All, 

First off I am new to managed switches so go easy on me.

I just purchased this unit used and have it connected using Putty through a USB to serial cable.  Once the device starts to boot it passes all the POST tests, decompresses and gets to the point it says STAND ALONE.  At this point it freezes.  I can't get it to move past that no matter how long I wait.  I  have tried Diagnostic Mode but it just freezes and says DIAGNOSTICS.

Any suggestions. 

Thanks, 

Jason