I recently jailbroke my iPod, and the first thing I went to do was install WinterBoard. it asked to reboot, and I knew I had to reboot it with the computer, but I have one problem. It won't enter DFU mode. Whenever I try to enter it, at the bottom right corner of my monitor, a bubble pops up saying USB Device Not Recognized, and it doesnt let me enter DFU mode. Has anyone had the same problem, or know what to do if this happens?