I've had my H100 for 4 years now and had no problems with it.
I replaced my thermal paste so I:
- cleaned old thermal paste off the H100 backplate using paper towel and 70% alcohol
- did the same to processor
- put back the H100
- plugged the 3pin fan connector to H100 power slot in the wrong position
Reference image of H100 controller, not actual: http://i.imgur.com/mwhKtjL.jpg
Correct positioning of 3pin fan connector:
o x x x
What I did was:
x x x o
x: used pin
o: unused pin
I noticed that my temps were higher than before I replaced the thermal paste so I went to check what's wrong.
It is only by this time that I noticed the LED lights on the H100 controller are off the fans not working. After that, I tried the following:
1. Correctly replugged the 3pin connectors to the right slots
2. Removed all fans from H100 controller
Both attempts didn't make the controller light up again.
Do you think that this killed the H100?
