It wont turn on

Something I thought of is:
Check the battery door and also the card door (if there is one separate) for a small plastic "pin" or raised area, usually located on the door to activate a small switch to let the camera start. If the small "pin" or raised area is broken off, then the camera will not start. If this is the case, you can put something over (small enough) the switch and when the door is closed it will let the camera start and run. On one camera I used a very short piece of solder and some scotch tape..... The best in such a case is to replace the door (if you have the time and patience to do such a repair) or sell it for repair or parts.