Swipe down the top of screen to pull down the Notification Shade. Tap the Settings button in the top right corner of your screen. Swipe up to scroll down Tap language and input Tap language tap language of your choice
Check for the battery sticker colour. If it is pink, red or white with a horizontal stripe, the battery is damaged. test your battery in another compatible phone. If it turns on , well battery is in good condition else, You know....
if you are able to hear sound through headphone, the sound hardware on your computer is not working. and could be problem with the cable. Did you test for sound in windows. Double click volume icon in the taskbar and control slide in Volume mixer
iOS has a neat feature that helps when hardware buttons stop working. To activate this, go to the Settings app, and select General, then Accessibility. Scroll down to the Interaction section, and tap AssistiveTouch. Now tap the button next to AssistiveTouch so that it turns green and slides to the on position.
Try going to the Settings App and select general and then to accessibility. Check for the interaction section and assistive touch. Now tap the button next to assistivetouch and slide to the position (it should turn green)
I guess you might have tried the power switch. If still the lights are not coming back, then the standby power supply isn't working, or the TV's microprocessor is dead and not lighting the lights. Would you mind checking the 5 volt power supply. I don't remember any storm recently or any such power outage. Have a simple voltage test done. Get a voltmeter from nearby hardware shop. Better if you would hire some professional electrician.