GSM iPhone 4, currently running 6.1.3, was able to use redsn0w to run the first round of jailbreak using 6.0 firmware just fine. When attempting to "just boot", redsn0w goes through the full process and says "done", the phone shows the pineapple logo and stays there for several minutes, eventually the apple logo shows and the phone boots into the normal unjailbroken springboard.

Any ideas? My first thought is to try a different PC, the second is start all over.

Thanks in advance.

(And i did grab the SHSH blobs from 6.1.3 before attempting this before you ask.)