Ipod touch 4g with black screen, stuck?

my ipod touch 4g was jailbroken, then i restored and updated firmware. Now i wanted to restore again as it was a bit sluggish, slow, and didnt know which app was causing it, so i went to restore, put the ipod in dfu, but its got a black screen, everytime it goes to itunes, it says restore, i do that, it says wait for ipod to restart, and the ipod dosnt restart the black screen stays, and then itunes says restore ipod again. ive done absolutely everything, i am completely lost now
 
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