All is good in the world again. Turns out the USB port on my Mac had stopped working. A reboot fixed that. Also found that I had to point redsnow to the ipsw file. It wouldn't detect and point by itself. And it took me a long time to find the Semitethered package on Cydia. It seems to be working fine as well. That's how I spent my Sat.
Cheers
Glad you got it fixed in the end. Hope you enjoyed your Saturday!!!