Toshiba 32A10 Sound but no Picture, Red Light...

Question

Hello,My tv has had this problem for several months now. When you turn the tv on you (usually) get sound right away and always no picture. The red light blinks while there is no picture and the picture comes on anywhere from 20 minutes to hours later(you can't predict when it will work). If you slap the side of the tv, the picture at least comes on momentarily ... and usually you can get the picture to stay on after doing this enough times.Any ideas on what is wrong and how to fix it?TIA