I'm not sure what the problem might be.
Though I would respectfully suggest that you have a qualified technician diagnose it.
We recently got a tv from our neighboor who complained that it wouldn't turn on. We got it, plugged it in, and it seemed to work fine. After about a day we noticed the mentioned problem. We thought it might be a bad power button so we got a new remote. That didn't work either. The problem was initially that the tv wouldn't turn on at the first try, it would take several, now it won't turn on at all remote or button. When we try the tv will make a power up noise on occasion and the power light will either flicker or stay lit in between attempts. On a side note we left it in the on position and tried shaking it a bit(stupid I know) and surprisingly it turned on for a second with sound and picture before turning off again. Any help would be great, I'm not afraid to get inside it and replace parts, I have some experience with electronics.
Its a Samsung Dyna Flat Pro
Model # TXN3245FP