iMac 24 A1225 3.06 GHz with black screen?

Hello everybody, my iMac 24" 3.06GHz 2008 has a black screen but still displays video on external monitor. Did the flash light trick on screen but still can't see anything on it, it's completely black. I have googled my case but have found only similar situations, nothing exactly as mine. If anybody has had the same exact problem as mine and has found a solution for it and would like to share it I will greatly appreciate it. Thanks.

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Thanks for your response machead3. Yes all four diagnostic lights are lit up green.

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Forgot to also add that iMac works with external monitor and if I go to System Report it shows that External monitor, iMac display and video card are detected an they are online and all 4 diagnostic lights are lit up green.

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