I have a problem , if any one can help me please

After updating my Iphone 3G version to 3.0 I tried to jailbreak it using redsn0w 7.2 and after the jailbreaking done nothing changed on the springboard and still the cydia icon missed.

what is wrong with that? since all the messages which I am getting during the jailbreaking shows that everything is Ok.

HELPPPPP