Non stop booting

Maybe you can try these steps.
1. Try This First: Restart the iPhone
2. If that doesn't work, your next step is a hard reset. This is a more comprehensive type of restart that can sometimes solve the problem. Here's how to restart and hard reset the iPhone.
3. The Next Potential Fix: Recovery Mode
If neither type of restart fixed your problem, try putting your iPhone into Recovery Mode. Recovery Mode allows your iPhone to connect with iTunes and restore a fresh installation of the iOS or a backup of your data onto your phone. It's a relatively simple process and solves the problem in some cases. Here's how to use the Recovery Mode.
4. If That Doesn't Work: DFU Mode
If you're still seeing the Apple logo and nothing else has worked, there's a problem booting up your iPhone. DFU, or Device Firmware Update, Mode stops your iPhone from booting up all the way so that you can connect it to iTunes and restore the iPhone and start fresh.
5. Problems when upgrading to a new version of the iOS
6. Problems with jailbreaking the phone
7. Running a beta version of the iOS that has expired.
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iPhone Stuck On Apple Logo Here The Real Fix

If the Apple logo keeps flashing and never does anything, it is most likely stuck in a boot loop. You can try reinstalling the OS by connecting it to your computer, but if that doesn't work, the boot loop is most likely caused by a hardware failure.

Try holding down the power button and home button together until the apple logo appears and it tries to boot up again..

Re-download the ipsw file that was on your iPhone, Download Spirit to jailbreak, and that should do the trick.

Find your solution from the list,
Apple Iphone Smartphone
Codes:

• Unlock Code,
• Password,
• Puk Code,
• Lock Code,
• Other Codes.

Software & Hardware Problems

• Software Problems (Hang, Youtube etc.)
• Hardware Problems (Display, Charging etc.)

Find Your Solutions for other Apple Products:
Apple Iphone 3G
Apple iPod Touch Digital Media Player

Try a reset. Hold the sleep button and the home button together until phone turns off and release buttons when you see the Apple logo. The re-boot should take a min or two. This generally solves a lot of problems.

Jim

Sometimes the iPhone can lockup and stop working or just show the Apple symbol and not do anything else. But panic not, normally an app has caused the phone to crash and it needs to be restarted.
Here’s how you do it:
Sometimes just pressing and holding the home button for about 5 seconds, can help. But if not try this:
Press and hold the iPhone’s Sleep/Wake button and the Home button for several seconds, or until you see the apple logo on the screen.
If you still have no success with the reset the only other option is to do a restore using iTunes. This will wipe you iPhone bust should get wit working again.

Try a hard reset.

1. Press the home button (the big circle below the screen) and the sleep wake button (the button on top of the iPhone) simultaneously.
2. Hold both buttons simultaneously for a few seconds, Ignore the "Slide to power off" and keep holding
3. The iPhone should now shutdown automatically - (fade to black)
4. Turn the iPhone back on by hitting the sleep/wake button.
5. You should now see the Apple logo, your iPhone is restarting and thus booting up.
6. You have completed a hard reset successfully.

did you try restarting it(hold the home n lock button for 10 sec)