Strange Problem

I have jailbroken over 100 ATV2 since January 19th, all brand new.

 

However last night I had a problem with just one ATV2.

 

Firstly, the ATV is not recognised in ITUNES, i have restored it to factory settings via the tv and tried again to no avail.

 

When I do manage to get into DFU mode, it goes through the motions then gets to Itunes and does nothing.

 

The white lights on the front are flashing irregularly.

 

How can I work round this problem? Very annoying