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New RAM not working in Dell Inspiron 3558

I recently took my laptop apart to install a new chip of RAM into the extra slot. Everything seemed to have gone well except after I got my laptop pieced back together I tried to restart my laptop and it started making a very loud beeping sound repeatedly. My laptop went to an error message stating something along the lines of "No memory detected on previous boot" and gave me the option to restart, and upon doing so my laptop starts up without the beeping. 

The problem is, my laptop still says it only has 4GB of RAM instead of 8GB and my laptop will repeatedly beep very loudly any time I start it up.

How do I get my laptop to register the new RAM I've added and stop beeping every time I start it up? 

The model number on the new RAM I inserted is M471B5273DH0-CH9

Any help is much appreciated!

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