Well i have this all the time on MB models of the Itouch 2nd gen models 8gb's. I have the blobs backed up always for 4.0 and lower. the problem tho is when i update to 4.0.2 just to be up to date or w/e and then go and do the jailbreak via redsn0w b5-5, when it gets to the part where its actually jailbreaking it it will say "Waiting for reboot" but the itouch just stays at a black screen. this happens 98% of the time and i have not a clue why. Not that it NEEDS to get done, im just curious to know the answer.