One solution here is to force reboot your iPhone. To do that, simply press & hold the POWER & HOME buttons together for around 3 to 5 seconds or until the logo appears again.
If in case the logo appears but it still won't go through, the best solution is to re-do the jailbreak, which in your case I assume is by using greenpois0n.
If you are familiar in using this jailbreak tool (greenpois0n), download it by using the links below then re-do the jailbreak to fix your iPhone 4.
If you're not at all familiar with this, you may read the step-by-step guide on using greenpois0n right here on FixYa. CLICK HERE to read the guide.
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