I'm just curious how do you have free electricity? Some one must be paying for it right?
company pcs?
who cares 
... but sometimes the miner be silent ...
if you are usin windows you can check functionality just by click on that cmd window and press ENTER (if miner will run after this, you can use this guide)
right clink on cmd window top layer and click on properties
then uncheck:
- Quick edit mode
- Insert mode
OK, done
edited: its just happend sometimes