Black Screen While Playing PS3 Console On Toshiba Regza 42X3500E

I Have A Problem While Playing My PS3 Console On Toshiba Regza 42X3500E. Everytime I Play It, The Screen Will Go Black But It Still Has The Sound. I Tried To Turn It Off And Turn It On Again. It Worked But, After A While, It Turns Black Again And I have to repeat those steps again. But, each time I do this, the interval getting shorter and more often. First, I thought it was caused by the overheating PS3, but even though I have cooled the PS3, the problem still persists. What's the solution for my problem?