Why won't my guitar work?

right,i lent this guitar of my friend,and the Over Drive doesnt seem to work on it anymore,the first time i played it i had to press the lead into the guitar hard to make the OD work and now it just doesnt work at all,i have tried tightening the lead socket and it still wont work,does anyone know whats wrong with it and how i can fix it ( its a schecter Diamond Series Revenger)