I just bought an Acer A100 tablet from eBay, I activated the pattern password and my son locked up the screen because he put the pattern in wrong too many time. I have tried everything . I held down the volume button to do a factory reset and I tried to login in with my Google account and it said the username and password was not correct and I know that is not true. I even deleted my old Google account and reopen another one and still nothing. This tablet is not even a week old, i would like to avoid Acer service center. I am willing to try anything. I was useing 4.0 system software(ice cream) at the time of lock up.