Macbook Pro 4.1 RAM Upgrade Issues

Hello Apple Community. I recently decided to upgrade the RAM on my macbook pro 4.1 (15", early 2008, 2.5 GHz). I purchased and installed 4gb of Mushkin memory (2x2GB PC2-5300 SODIMM), and the computer booted up just fine. When I go to "About this Mac", it still shows 2GB of RAM, 2x1GB. When I click on "More Info" the same holds true while specifically looking at the memory. For some reason my computer is reading each 2GB card as a 1GB card.
Any suggestions as to what may be the issue?
Thank you in advance.
PS. I've been searching forums and the web for the past 2hrs in hopes of finding an answer.

Okay, I will try this out. Previously I had done something similar to that which you suggested, which leads me to think that the RAM possibly could've been mislabeled and I was given 2GB (2x1GB RAM). I took one stick out and booted up the computer and my mac really took its time starting up. When I checked the "About this Mac" section it now said 1GB of RAM. I'll try again with both cards, but it looks like I will be sending them both back for replacements.

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