I have a problem with my 2013 Mac Mini.    
  
Turned it on for 2 seconds last night and accidentally shocked it.  Today when I turn it on the cursor moves, but... 
  
1.  Can't click on anything 
2.  Dock which I have hidden on the right won't pop out. 
  
I can right-click with the mouse and that works - but I can't deliberately (left) click on anything to open plus the dock issue.  I tried a wired Mac keyboard and mouse - same problem. 
  
I did go into target disk mode and can boot off my OS drive using an older iMac we have and that works.  Runs just like a normal computer.  There's 190gigs of space left on the OS drive... so at this point I'm stumped.  Zapped the PRAM as well as the SMC reboot. Don't know if I did something when I briefly shocked it last night or what.  It does power up but no mouse - either bluetooth or directly plugged in.