Help me toshiba tz50v51 theaterview

hia all, have a toshiba tz50v51 theaterview proj. tv you can here it power up when you plug it in, but the screen stays black and the power button blinks and it won't do anything at all-can anyone., lm click remote control a lot of time ( power on/power off}) until the screen turn on..later when watchin a program or a movie..the tv shut off again , the power up blink and the black screen come again...
so l need unplug for some time?? 10 or 15 min...pls help