Why won't the LG Optimus L90 turn on?

no power to cell phone but when plugged into usb drive on computer it will turn off and on computer says usb device not regonized

It never turned on. Ive tried to do it but it didn't work. Then i tried it for one hour, only left with disappointment. Please... Help

That's odd. Try charging it on a wall socket for about 10 mins then try turning it on again.

Please let us know what happens.

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