When i plug the tablet into the charger there is no response and when i try powering up i get a quick flash and vibration alhough it doesnt boot up, i have tried holding the volume+ and pressing the power button for different lengths of time and still nothing, the product is a little over a year old, it is a 'lenovo tablet pc ideatab A2109A-F' model:2290, any help would be great thanks.