A word to the wise, or perhaps to the unwise: Whenever I have used a reboot function on SB Settings or Cydia has forced a reboot, the iPod will not start. It will attempt to reboot, and you will see the Apple symbol, however you get a blank screen once it is done loading. My computer still recognizes the iPod touch and syncs with it, but the screen remains blank. I have had to restore and jailbreak both times this has happened to me. Powering on and off doesn't appear to be the problem, it's only rebooting that has caused it, at least in my case. Perhaps this is an isolated case, but I would just turn it off and on manually instead of using a reboot function just to be safe.