Not knowing which model Samsung you have, I'll make one suggestion. On the top of the unit near rear right is a big cover. Under it is a power supply, mother board and inverter board. There is a small fuse in a holder that sometime blows for no known reason. Make sure the power is off (volt meter) b4 replacing the fuse with same size and capacity. It's a flaky failure and may never happen again. It can be a major pain to pull one out far enough to unplug it, but it could also be what last2die said.
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