Got a new generic tablet from an eBay seller today. It has no unit-specific instructions, just an Android instructions booklet. This is my first tablet, so I don't know much about them. I plugged in the charger. It showed what looked like a flashing full charge for a few minutes, then went to a little Android logo onscreen. I pressed the on/off button, nothing. I unplugged the charger and tried again. Nothing. I looked around online and saw that the button has to be held down for a bit, but that didn't do it either. Am I making a stupid beginner mistake? Did I get a pre-bricked unit? No response from the seller yet. Thanks for any advice on this.