guys for all these ppl who didn't jailbreak the iphones because of black screen on white screen after redsn0w now am offering the 100% guaranteed solution !!

All u have to do is restart your computer and enter the Safe Mode which is ( pressing F8 before loading windows screen and select Safe mode ) and then you can run Redsn0w normally and it will jailbreak normally !! tested by me 1st time success i guarantee it myself !

Any More questions am here !!