My lumia 720 suddenly stuck and black screen with ...

Hi
My lumia 720 suddenly stuck and black screen with Nokia Symbol is displaying I have tried for soft reset but it doesnt work will someone help me its very urgent
varun

You can try to perform the soft reset again. If this would fail, below hardware key reset combination is what I can suggest. This deletes all the personal content of the phone.
Option 2: Hardware key combination
Use this option if the phone fails to fully switch on when pressing the power on key.
Note: No warning about data loss!
Nokia Lumia with Windows Phone 8
Step 1
Make sure the charger is disconnected.
1. Switch the power Off.
2. Press and hold the Volume down and connect the charger, if succeed an exclamation mark (!) is shown on the screen.
Step 2
Then input the keys in the following order:
1. Volume up
2. Volume down
3. Power
4. Volume down
Step 3
The phone will reset and boot up automatically. Please note that this may take several minutes.

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