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Lcd monitor turns on for 1sec perfect then gets black!!? - lcd flashlights

yes ... My 4-year-old to Comaq LCD monitor perfect for 1 seconds, then so dark, I see the picture when I get a flashlight on the screen.
I went to Frys and bought a new power cord, but still do not have everything you
Both connect the plug to the community with my laptop and still nothing, whyyyyy links?
others say that the power supply, but the power light was still green, and the picture still works Barly
What is the problem?