Black screen all I hear is chime

Iv tried all the keyboard combinations to reset pram and using a cord to project screen onto a different max an all the basic troubleshooting I could not get it to work. So I took off my screen and removed hard drive and plugged it into a different Mac. It works fine. So what else could it be ?

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R schneider what are your diagnostic LED's showing you? Come trovare e leggere i LED di diagnostica

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#2-4 are all on with the computer powered up. Led one is off @oldturkey03

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#3 is also on

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@R Schneider #1 is off? Odd.....

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The screen is also off my Mac

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