My Sabre Plasma Tv Is Either On Sleep Mode Or Standbye And Now It Wont Come Back On What Should I Do?

It would be your best interest to leave tv off until you contact a repair shop as more damage could result from trying it several times.
Call the repair shop and explain the symptoms and ask for some advice
Most places will give you quality time of theirs.
The repair shops that give free advice deserve your buisness should you decide on repair Good luck Houndgrey