so i jailbreaked my ipod touch 4g 1 0r 2 months ago and cydia use to open and so as safari but today

when i installed parallax using ifunbox i respringed my ipod but when i tapped on cydia it didn't open

safari was opening every app or game was opening except cydia i went to redsn0w and choosed just boot still no affect just a black screen and it closes anyone knows how to fix that?