I installed memory to my 2007 imac.  When I turn the computer on it is making a strange noise and the screen is blank

I installed memory to my 2007 imac.  When I turn the computer on it is making a strange noise and the screen is blank

Are you hearing beeps?
What was the spec of the RAM?
What was the brand of RAM?
Have you double checked that the RAM is properly seated?

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