Television and Home Theater

some reason the tv shut off and will not turn back on i have pushed the reset button waited for it to quit blinking turned tv on and the light comes on but a few seconds later goes out and tv just will not turn on what could be wrong?

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..      

I have a Sony with no video ..lots of sound I have replaced the flyback, the deflection board,  c517, and c516, also changed the convergance chips,  and replaced the crt boards, i have tested all the resistors and pico fuses, nothing works completely frustrated, any help would be appriciated..