Nokai Lumia 720 Suddenly went blank and switched o...

I bought nokia lumia one month back, Suddenly my phone went blank one day and it turnd on automaticcaly, and now my voulme down key is not functioning. what shall i do, shall i goto Nokia care and exchage for a new one?
Solved!
Go to Solution.

Try Hold volume down and the power button until the device reboots.
If i have helped at all a click on the white star below would be nice thanks.
Now using the Lumia 1520

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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.
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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.

The iPad suddenly went black and we cannot switch it on again. Can someone help?

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This exact same thing happened to me too yesterday and trying what you said has just fixed it right now! Lucky I happened to come across this discussion while looking for a solution and has saved me a trip to Genius Bar tonight.
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Nokai Lumia 720 Suddenly went blank and switched o...

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