how can i repair my Motorola v3?

My Motorola razr v3 was already used and needed a new battery before i bought it. Now i don't know whether it needs one now but i just thought i might mention it. the screen decided to go white and has said no signal several times when i was in the middle of doing something on the phone. It then decided not to work for 24 hours. It wouldn't charge or anything. Then when i left it for a while it was fine. Now when i take the battery out and put it back in, the buttons will light up. when i turn the phone on they will light up but their is nothing coming on the screen. It's just blank.