TV wont turn back on.. Help

I have a 46'' RCA P46924 And I was playing my PS3 on it one day, I turned it off and now it wont do nothing, But make a thud sound out of the speackers..

I am disabled and we don't have much money, Hope I can get some feed back on this and what it might cost us to fix it, and if I can fix it myself?

Thank You for any help you can give me... And I would like to say Hello to everyone, for I am a Newbie here...

Merry Christmas and Happy New Year to you ALL..