The first and most important problem is at the back end of the screwdriver. What you are asking - if you are serious - is not too different than saying "My car won't start, what do you think is wrong

Either take the bike to a shop, a knowledgeable friend or do a LOT of studying of the Sheldon Brown and Park Tool sites, following the procedures from start to finish. Then, if you have remaining problems, come back to the forum with a full explanation of what you have done and what problems remain. Using proper terminology and spelling will gain you the same respect you give by doing so.