My iphone 4 won't turn on, but I know it's fully charged. What should I do?

My phone will not turn on. It was being a bit glitchy the night before but I ignored it. Anyways, whenever I plug my phone into my charger, it vibrates but I can't turn in on. The screen stays black. What should I do?

Try this trick to do a hard reset on the phone. Hold the home button (bottom) and sleep button (power on/off button on top) at the same time for 10 seconds; this will reboot the iphone; hopefully the apple logo will appear. The program and data will remain.

1-hold the power button and the home button to reset your iPhone for 15 seconds

2- connect it to the itunes check wither it's available on the laptop you will get an additional usb input on the tool bar at the right side

3- if you could here sounds from your iPhone that means your screen is not working properly

if still not working so your iPhone need maintenance

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