Seeing that your phone bent in a cure there is a possibility that the screws got bent as well if you can find a small screw driver to use then use it. If you still can seem to get the screwws out go to you local apple store and ask if they can do anything to help you.
If it is battery opperated try and get a replacement battery. If that dosent work try and find a new power cord for it because depending on how the power cord was when it was stroed if you straited it out of having it in storage for a while it might have broken a wire in the cord. If a new power cord dosent help try if possible oil the motor it is possible that over time it could have gotten a little mosture in it due to where it was stored. If any of these dont work you will sadly have to get drill.
Try taking the batter out and putting it back in. If that dosent work then take the batter out and take a pencile eraser to the battery connecteors and then blow away the eraser havings away and if they dose not work you will most likely have to buy a brand new battery. I hope this helps you fix your problem.
The best way to try and fix this is take a pencil eraser and rub the gold connectors on the battery then wipe off the shaving that came off the eraser that are on the battery. I do this will all my old phones if the battery has troube it works perfeclty after that should give it a try. Sorry for such a dated answer I thought it would help if you still have that blackberry