Mitsubishi VS 50607

my televison is 7 years old. My television just shut off by itself while I was watching it this morning. My daugther even watched a movie on in when she got home from school around 2:30 -3:00pm EST. Now when I come home from work around 5:00pm. I press the power button the green light comes on the a second later its off. I unplugged i for a little while then plugged it back then the green light flashed three times but still wil not turn in. Previous to this the tv has be working fine. I dont have a manual so I cant see whats wrong. PLEASE HELP?!!!