My iphone won't turn on? What should i do?

I jailbroke my phone nothing went wrong. This is like a week later and i have dreamboard and i downloaded a theme called metro 8 and i could not get off the theme. So i turned off the phone now it keeps turing on and on and off with the reboot circle! What should i do please!

That's what happens when you jailbreak it.

I'm not exactly an Apple user, but from what my mates have told me they have done factory resets on their phones.

Please note that if you restore your phone, all data will be deleted.

Its just a suggestion. Or if you want you can try and claim warranty