Restarting boot loop

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Hi. I have an iPhone 4, ios 7.1.2 . I recently jailbroke my iPhone using Pangu tool. It was a success. I got cydia installed. When I powered off my phone, and tried to power it on, I couldn't boot back in. I am stuck in a continuous boot loop with the iPhone restarting every 15-20 seconds. I cannot enter recovery mode as my buttons are not functioning. I had made a backup before jailbreaking, but when I connect it to iTunes, it asks me to press trust on my iPhone, but the only thing I see on my iPhone is an Apple symbol with black background. PLEASE HELP ME....

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