The ME Super is a good reliable camera, in my opinion. I bought 2 of them new back in the early '80's and both continue to perform perfectly. I am not familiar with the "sticky mirror syndrome" mentioned above.
Do check your batteries first. By half-pressing the shuttler release button, you should see the colored LEDs in the viewfinder on the left side. If not, your batteries are dead, and they likely are if the camera has not been used for years. They are cheap and last a long time.
The ME Super shutter will fire at 1/125 with dead or no batteries when set to the 125X position.
You can likely find a reputable repair shop near you, but if not, Eric Hendrickson mentioned above has been recommended by many. Pentax is his specialty. His website is http://www.pentaxs.com/index.html. If you need a user manual for this camera, you can download it here: http://www.butkus.org/chinon/pentax/...x_me_super.htm.