My Macbook 4,1 came with 1 GB of memory. Only 512MB shows up in the activity monitor. I just upgraded the memory to 4 GB. Although 2GB shows up in DIMM0 and DIMM1 it still only says I have 512MB of memory. Can someone help?

My Macbook 4,1 came with 1 GB of memory. Only 512MB shows up in the activity monitor. I just upgraded the memory to 4 GB. Although 2GB shows up in DIMM0 and DIMM1 it still only says I have 512MB of memory. Can someone help?

So when you go to  > About This Mac - How it should say how much ram there. Click on More Info - And click on Memory - What is in those fields?

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