Black screen after software update

my ipod touch 2g recently quit work after i went to update the software and itunes it started with a white screen then, the itunes symbol and a connector pointing to to i attempted to restore twice when on the 2nd try it just went black.. it dosent show up on the i tunes menu anymore and when i try to restart it... it dosent do anything when i plug it in my computer beeps but i got a popup that says the device isnt reconized i have tryed everything in all the help menus so im lost