Iphone won't unlock, blank screen?

So, I installed a barrel roll app on cydia, and after it restarted the springboard, there was nothing. No slide button or passcode, just my wall paper picture. And when I try to sync with itunes, it says to unlock the iphone, but there's nothing on the screen to unlock.

Restart it

Put it into recovery mode and do a full restore.

Power it down completely, when it's shut off, press the power button while holding the up volume booting up. This will put you in safe mode with mobile substrate disabled, now you can go in Cydia and delete what you have downloaded.

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