my RCA 32" flatscreen model# 32F530T wont turn on. Help!

One day I came home and the TV was buzzing. It wont even turn on. I unplugged for a few days. I went to plug it in and it still buzzes. I have checked the outlet on the wall, and it is fine. Can anyone tell me what it might be. I want to ask around, before I call a service technician. Thank you.