Cydia will not load after unlock!!!!

[de_imagez]

I updated my iphone to the 4.2.1 and unlocked using redsnow 0.9.6b5 everything went fine with ipad baseband. went to cydia installed ultrasnow and sb settings after that. Cydia stopped working doesnt load anything it opens up but it wont load any sources or anything and I tried putting the 4.1 firmware but my iphone kept freezing I have the 3gs old bootrom . I need my cydia back!!! please help

[eyeRobot]

Maybe stupid, but did you try killing cydia in multitasking tray and restarting it?

Also try reinstalling OS and baseband.

[de_imagez]

How do I kill cydia in the multitasking thanks for your help..

[de_imagez]

Also I tried reinstalling iOS and baseband since I have old bootrom I did the untetherd way. Since cydia didn't work I tried tethered and still cydia doesn't work. It's really frustrating