The menu function still exit. Try to long press menu button for 3 second, app menu will appear.
Also, pinch in by 2 fingers on home screen to access widget, wallpapers change option. Pinch in by 3 fingers to change homescreen :D
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In fact, I had 2 or three usb cable, my Mi3, my Mi2 and my kindle fire HDX USB cable. My Mi3 cable have problem as Mohammed Fayaz. But when I charge with Mi2 or Kindle HDX cable, everything works normally :). Some people I know, had problem with Mi3 usb cable too :D
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