Cydia crashed and now my iPhone is mucking up

My boyfriend downloaded cydia onto my iPhone but he was unsure if it'd work on the iPhone. It then starting rebooting a lot and then last night i got a notification saying cydia had crashed and stuff. Now my iphone won't turn on, I press the home button, it won't respond. I press the lock/unlock button and it still won't respond. It still doesn't respond when i put it on charge too. My boyfriend doesn't know how to help. So how can i delete Cydia when my iPhone won't respond? (this is my new ihone 4s, ios7 update)

Restore your iPhone.
put your iphone into recovery mode, follow these steps:
http://www.imore.com/...overy-mode

and then connect it to itunes and click on the restore buttton, the instructions will be on screen.

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