My iphone 4 is stuck on the apple logo?

, i was trying to download a cydia app and i don't know how to fix it.whenever i press the home and the power button it turns off for a few seconds then it restarts again
please help!

Added (1). I tried to recover from itunes, its still doing the same thing >.<

Added (2). It worked!

I'm going to guess you never downloaded the untether download form cydia. If that's the case, then you're going to need to plug the iphone into your computer then open up the program you used to jailbreak it. Somewhere in that program there should be an option to reboot your ipod (leaving it connected). Just follow the onscreen instructions and that should resolve your problem. If none of this works, the your best bet is to plug it in and try to revert it to it's original settings on itunes, however it sounds like you already tried that. There are many forums and other websites online that should be able to answer any questions you have about these troubles.

Maybe you should restore the i phone on itunes

Did you restore the whole iphone?
like erase everything then rejail break it?

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