Just replaced my screen. when the computer starts up it goes immediately back to sleep.

After replacing the LCD sceen on my 2006 intel imac, I turned on the computer, first blue screen then black, restart computer apears to have boooted up but immedetaly goes back to sleep.
any ideas?

After replacing the LCD sceen on my 2006 intel imac, I turned on the computer, first blue screen then black, restart computer apears to have boooted up but immedetaly goes back to sleep.
any ideas?

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