I purchased a velocity Cruz tablet micro T408 around last December. it worked perfectly at first. I didn't use it for a couple months because I didn't have a charger. I purchased one that was specifically for this tablet. When I plug it in the LED light comes on for about three seconds then turns off. The tablet was left on the charger and it will not turn on. I tried setting it. I also tried holding in the volume up button and power button at the same time. It won't turn on. would you have any tips to help me fix this?