So I was installing my new fans into my case and I turned my pc on to make sure they were working. A message popped up saying something like windows repair can restore to a certain point in time. My mouse and keyboard weren't working and I wanted to shut my computer off so I flipped the switch on my PSU. I installed all my fans and went to turn it on and it wouldn't. I checked all connections and everything was plugged in and I used the power cable for my monitor on my PSU to make sure it wasn't the cable and it still didn't work. I don't know what to do next. Any help would be much appreciated.