Wifi cannot turn on SII
<p>When I turn on wifi on my Samsung Galaxy SII device, wifi cannot fully turn on and look half way just like attach screen. Then screen is closed when screen-timeout reach. After all, screen is black (dead) and cannot open my phone again. That's why remove battery and open it.<img src="http://i.stack.imgur.com/keYh8.png" alt="enter image description here"></p>
