IPhone 4 6.0.1 jailbreak

I have the latest redsnow program and do everything correct but it doesn't want to jailbreak it, it exploits and what not but it won't reboot.

Does it get stuck on that blue screen?
Make sure you manually select the 6.0.1 ipsw file.
Sometimes you need to reset phone by holding both buttons (home/power); I usually do it until i see apple appear, disappear then reappear for the second time. Then put it in DFU and try Redsn0w again. Make sure you boot tethered after the jailbreak since its only tethered right now.