Hello, a few days ago I bought a second hand Blackberry playbook. It was without a charger, but still had some battery and functioned perfectly, and connected to PC through USB. Today I bought a charger(unoriginal, couldn't find an original one anywhere and didn't want to wait for shipment from other country)(Charger output:5,2V; 2,1A, original charger output:5V; 1,8A). Now my playbook is stuck at 0% battery. It won't turn off while plugged in, but it won't charge either. Could this be a problem with the tablet, or do I need an original charger? Someone please help me.