In many cases, reseating (pulling out and re-inserting) the lamp may fix this symptom.
If not, you may need to contact the Samsung customer service center to have your television diagnosed and repaired.
I have a Samsung model HL-P4663WX/XAA. My 16 month old kept turning the Power LED on and off....now, No picture, no sound. Unplugged it, and when plugged back in, The "Timer", "Lamp", "Stand-by/Temp" lights up but does not blink. Still will not power up.
...could we possibly need a new DLP Lamp? The manual states the LED lights should "blink" when the lamp is dying.