I'm sorry to hear that you're having this issue.
Unfortunately, there's not much I can suggest in the way of troubleshooting. It'd probably be best to have a technician come out and inspect your unit. If you'd like one dispatched to you, one can be arranged by calling 800-SAMSUNG.
I have Samsung 50" plasma tv model HP-S5053. The unit would not power on and blue light was out. Tried a different power source which did not change result. But now if I unplug the unit for a few minutes then plug back in, tv will power on for a few minutes then turn off. Also, now when I unplug for a few minutes and replug, it powers on automatically (without touching remote or power button), then dies again. In any event, it won't turn or stay on.