My iPhone 4 is stuck on a black screen with spinning circle?

My phone is stuck on a black screen with a spinning circle, my phone will load up when charged for 10 seconds before an apple logo pops up, a loading bar pops up and afterwards the spinning circle, note I'm jailbroken.

Hold the top and home button for a while until it does something. My phone was doing that and I think I held the buttons for 10 seconds?

This sounds like a reboot loop. One option could be using TinyUmbrella, using the "fix recovery" option. If that does not work, try restoring and jailbreaking again.

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