Does not want to charge when on the charger and is plugged into the wall.

My droid Incredible 2 does not want to charge even though i have it plugged into the wall. i just got a new cable for it and still nothing it will only charge when it feels like it. I took it to my verizon store and it charged for the lady but even on my charger but it wont for me i dont get it. the cord has to be perfect or the light goes out and im not due for an upgrade till august. Anyone have any clue what i can do for now so i can use my phone?