I purchased a tour in August of last year and just yesterday the trackball stopped clicking. it still scrolls up down and side to side but if i select a app and click it does not do anything and the app does not open. it does this for everything i cant enter or select anything what should i do.
Clean the trackball. There are a lot of different methods posted in this forum, I'll try and locate a link for you.
EDIT: It may not even be dirty, possibly just the typical trackball problem with the Tour. Have you talked to your provider? They may just send you a new phone or a refurb for nothing.