I jailbroke my iphone now it won't turn on, so I reset it and it still won't turn on?

I jailbroke my Iphone a few days ago, it's an Iphone 4. Everything was working fine until today when I installed a tweak. After the tweak installed I had to restart springboard, now it won't turn on. The apple logo pops up then goes away. I plugged it into my laptop and reset it but it's still doing the same thing.

Try booting without all the tweaks. Here is how:

1. Turn off your phone.
2. When it is completely off, turn it on by holding Up Volume and sleep/wake button. Hold until you are brought to your home screen.

3. Uninstall the tweak you have installed and restart again.
4. If step 3 does not work, upgrade/restore your firmware using itunes.

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