I suppose that is a possibility but it dosent really seem likey... most new-ish computers can run fine with 1Gb sticks.. Check your motherboards max memory capacity and devide it by the number of slots you have. Ussualy that gives you the max size per slot that way.
If you have your motherboard manual it should be written in there, otherwise got to the motherboard manufacturers site and look it up. (Or download the manual) If you dont know what motherboard you have, download Belarc Advisor and it should tell you.
dont forget that if a computer can cope with a 1gb stick, it does not mean it can cope with all 1gb sticks. eg. it might run with a stick with say 16 chips on it , but then might not run with a stick with 8 chips on it due the different 'density' of the ram (ie. high number of megabytes in each chip)
You have probably bought ram that is incompatible with your mboard. Testing it in another mboard won't necessarily prove anything, and there is probably nothing wrong with it. See this, especially response 12: http://www.computing.net/hardware/wwwboard/forum/41305.html
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