My iphone 4 is jailbroken on 5.1.1 and now cydia won't open

Or any apps i downloaded off of installous. I've had it for about a week and then my phone died, once i recharged it, it was like i never jailbroke it but i still have cydia and installous and the apps i got for free but now none of them open, they all crash immediately, even safari does… Help please?

You, my friend, have a tethered jailbreak. This means that if your iphone shuts off for any reason that most web apps and cydia apps won't work until you re-jailbreak it. On the computer that you jailbroke your device, open up the redsn0w application. You get two options 1 Jailbreak 2 extras.click on extras (make sure your iphone is plugged in and powered off). Then choose the first optioon: just boot.clisck that and follow the instructions.