Black screen after changing out HDD

After changing the hard drive, I plugged it in for the first time to check that everything was working. I unplugged then plugged in again and glued the screen and since black screen with the same symptoms and led 4 off. I don't understand how this could have happened knowing that I had disconnected the power. An idea ?.

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Please check your model info so we know what you have.

Did you follow the iFixit guides and use the correct tools?

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