8GB installed, only 4GB showing

I installed 8 GB of RAM into my iMac 24 just after I bought my machine but since reformatting my internal drive my machine now reads 4GB.  Is there some setting somewhere that I need to turn on to allow the machine to register all 8GB?

We need to know EXACTLY which iMac you have and EXACTLY what RAM you installed. I suspect you installed RAM that is incorrect or you have installed 8GB into a machine that can only address 4GB (or possibly 6GB) of RAM.
To find out what iMac you have open System Profiler (Applicactions - Utilities - System Profiler) and copy the first page. It will look something like
DO NOT, REPEAT DO NOT include your serial number information.

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