My iPhone is jailbroken and won't start up?

So yesterday, I jailbroke my device and started adding tweaks to it. And I've been using it the whole day; no problems at all. But just as I put my phone down and plugged it to its charger, it kept making the respring/rebooting noise. And since then its stuck at a dull apple logo and won't turn on?

Also it was working just fine before I left it to charge, the problems kinda started when I left it to charge. I have an iPhone 4S.

You should enter your iPhone in safe mode and delete the very last tweak you've installed.
But I suggest you to erase all of the tweaks and that's because you hadn't plugged your iPhone before installing all of that tweaks so you do not know which tweak is causing this error.
and for deleting the tweaks I will introduce a tweak to erase them with just a tap, here's some information about it:
http://ilexrat.com/
With this tweak you'll restore your iPhone without losing your jailbreak.
Hope I helped.

Put it in recovery mode and then connect it to itunes and restore it.

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