i have a ipod touch 3g and i jailbreak it with blackra1n. so when i close it and a want it to turn on it always requiert to go on blackra1n and make it rain each time. i had no problems with that but now when i tring to do that windows said that there was an error and that it must close blackra1n. and it always do that.
You can use blackra1n on another computer. It doesn't have to be on the computer your iPod is synced to. Just download blackra1n to another computer and try that.