Hi there,
Sounds like it is toast, but try this first. unplug for a cooling period.
Hold the reset button down and plug it into the usb port while doing so.
Does it make the windows detected device sound?“ding”
If the camera module is not plugged in all the way it can get very hot. AFAIK.
use a heatsink on the bottom.
HTH
GL 
PJ 