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If you slide out the keyboard, and hold down the X key and then press and hold the power key, then continue to hold both for about 15 seconds... does the recovery screen appear?
Have you tried it, with the device plugged into a wall charger?
Ok, leave it on that same charger for 30 minutes and try again.
If it doesnt work, it could simply be a dead battery. I suggest you going into a Verizon store and testing it with one of their batteries, and if that doesnt work then yes... the phone would need to be replaced.