my phone wont turn on?

the first time my phone wont turn on the repair man said i need to have it reprogram. so i did. it worked after a few weeks i had the same problem. so i had it fixed again. now for the third time the repair man tried to reprogram the phone but he said that the "flex" should be replaced. now my phone is just sitting here in my closet. i need a good advice before i have it fixed again.