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Reset your phone.
Important: Resetting your phone erases all personal content, including apps, and restores the factory settings.
1. Make sure your phone has enough battery power, charge your phone for at least 20 minutes.
2. Switch off your phone, and disconnect the charger.
3. Press and hold the volume down key, and connect the charger. An exclamation mark (!) is shown on the screen.
4. Press the keys in the following order: volume up, volume down, power, and volume down.
5. Wait for your phone to reset, during the reset there will be gears rotating on the screen for up to 5 minutes, after which the screen goes blank for ~30 seconds and then your phone will restart.
6. Go through the initial phone setup, if the date and time are shown, ensure the values are correct.
7. Disconnect the charger.
That usually means dirty power. Make sure you are using a good cable to charge the phone, not all micro-usb chargers work...for example some of the motorola chargers. Make sure there isn't a short in the charger cable. See if the same problem occurs when you attach to the computer USB.
Charge the unit over night, Plug in the AC charger and you should see a lightning bolt over the battery bar graph display.
With the charger plugged in, gently press and hold the on/off power until the screen goes black and displays the text "Charging battery". After a few seconds, the screen will go black to conserve power. At any time, you can press the screen and it will light up saying its still charging.
If you let it go over night, when you touch the screen, it will say Charging Complete and you can then remove the charger. You should have full green bars on the battery indicator.
Try taking the batteries out ( fully disconnecting them from the gold contact points) ... then put them back in with the charger already plugged in. It should go to that blue charge screen instead of turning on. LEAVE IT ON THAT CHARGING SCREEN for at least 5-10 mins. Now, Hold down power, screen goes black... then tap power about 2 seconds after screen goes out, and it should start up as normal. If taking the battery out has no effect, I would investigate whether that (the battery... being dead/unchargeable) is the problem. I'm hoping one of the two answers gets ya where you need to go.
OH AND YOU CANNOT USE USB CHARGER TO DO THIS. IT HAS TO HAVE DIRECT FROM-THE-SOCKET POWER TO CHARGE UP THAT FIRST BIT OF COMPLETELY TAPPED CHEMICAL (ELECTRICAL) REACTIONS.
My daughter is now going through two replacements for the screen going blank on this model. I'm still having to pay a deductible for a phone that was replaced the first time for the same problem this time. Evidently this is a common problem with this phone.