Jailbroken Ipod frozen, how to reset?

I would like to restore my ipod 4g, and I pressed the erase all files button on the ipod and now what the ipod goes into cycles of turning on and off with first the Apple Logo showing then the green poision logo. I connected to my computer but the Ipod is not showing on my computer, is there a way for the iPod to be sensed on the computer/ or another way of restoration?