Macbook ram issues

Hi,
I have a Macbook 2,1 with 2 X 512MB ram modules installed.
I am using menu meters and when I boot up it tells me that I am using x amount of ram and have y amount free just as normal.
The issue is that after a few minutes the amounts of used and free ram start to reduce to the point where I only have say 200MB bing used and 20MB free. By this point the computer has frozen and I am unable to do anything but move the mouse pointer. Everything else is unresponsive.
I have reseated the ram and swapped it out for different ram, but the problem still remains so I don't think that the issue is with the ram itself.
Has anybody else ever had a similar issue or does anybody know what the issue may be? Could it be a mother board issue?
Thanks in advance for your help...

Anthony,
Stedman is correct that your Macbook Pro will only support 2 GBs of RAM. However, you should be able to install the 2 GBs in a 2 X 1GB configuration. In fact, this would be the recommended configuration, as this would enable "Dual-Channel" access across the bus (faster).
Are you absolutely certain that you installed 2 X 1GB modules, and did so correctly? Neither module was seated improperly or incompletely? If you are certain, and it wouldn't boot, there may be something wrong (or incompatible) with one of the sticks, or your memory controller could be bad.
If you end up not being able to use both slots at once, you might have to stick with a single 2 GB DIMM. Of course, you could replace the logic board, but....
Scott

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