Iphone 4 factory reset taking forever?

Ok so i have an iphone 4 with version 5 and jailbroken. I did factory reset by 'erase all contents and settings' but the circle loading screen taking forever. What happened and what should i do now? How can i turn off my iphone.

Your iPhone 4 is stuck on the circle loading screen. Now you can try a DFU mode ora hard reset for your iPhone to exit the screen. To enter DFU mode:
1. Turn off your iPhone by pressing the Power button until it turns black.
2. Hold "Home" and "Power" button at the same time for about 10 minutes.
3. Release "Power" butoon but keep holding "Home" for another 15 seconds or so until you are noticed that you are successfuly into DFU mode.

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