Hello! I bought from ebay a charger for Samsung Galaxy S which can also charge an extra battery along with the phone. But when I plug my Galaxy on this, it pops up the PC connection menu, the screen trembles and doesn't respond correctly. My question is: Which of the following do you thing is responsible for this? 1. The charger? (If the voltage is right what makes it different from the original?) 2. The cable? (Original USB to Micro USB data cable) 3. The wall plug? (American to European converter) Specifications at the back of the charger: Input: AC100-240V~50/60Hz 0.15A Output: DC 4.2V~350mA~+-50mA USB 5.2Vd.c. 800mA Thanks!