My memory sticks are not being recognized by the computer...

I just installed 4 1gb sticks of memory in pairs and all of the same maker. I already had 2.5gb of memory installed. Once I turned on my computer and clicked the apple, it is showing that I only have the 2 gb of memory installed! Why is it not showing the other 4 gigs? It is saying those slots are empty and all 8 slots are occupied. I have a total of 6gbs but am only showing 2gb. I restarted my computer twice and keep getting the same result. All memory sticks are seated firmly in the slots as well.
Any suggestions?
I bought the memory sticks from a reliable vendor that sells Mac products.

I don't have the slightest idea of what you are talking about LOL! How do I do cold boot? How do I reset the nvram?
Another thing I noticed that was odd is that I took all memory out of the computer and installed just the 1gb sticks totaling 4gbs. Once I turned on the computer, my desktop screen would not show up on my screen. I got a solid blue screen instead. Once I removed all those sticks and replaced with the sticks previously installed my desktop screen returned! The new memory sticks are brand spanking new. Perhaps I could have had them installed incorrectly as I had them all in the same bank. I Will experiment again tomorrow.
Message was edited by: DVX100Shooter

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