The ideal by far is the LCD Monitor Repair site. Great advice, expert tutorials and step-by-step manuals makes LCD monitor troubleshooting a breeze. Of course, an aptitude for electronics does help, but it's your keeness to know more that counts. Hope this helps.

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I don't know which websites there are for that. But I can tell you that if you turn it on and the screen stays black, the backlight will need to be replaced.

Check the warranty status of your LCD. If it isn’t under warranty, there are companies that you can send your monitor to that’ll fix it. In many cases though the backlight is very simple to replace yourself, just depends on the monitor.

Good luck

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it depends on what the problem is if you left it on for more tham 5 hours it can over heat and worp this hapend to me so i left my tv off for a day and it went back to what it was like befor. or you could just tipe in your problem on googleand see what it comes up with
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What brand is your LCD? If you know visit its website and look for some guide there. Each website specially equipment provider have a page which is compose of guides, tips, what to dos to help their clients when encountering problems.
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http://www.fixya.com