You might try reversing the modules, some motherboards will want to see the larger module in a specific socket order.
dcc
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Make sure both modules are properly seated.
dcc
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It's hard to tell what is going on here with the scant amount of information you are providing, but it is looking like there is a compatibility issue here. Did Kingstom specifically recomend this module for your motherboard? The older motherboard running on PC100 could underclock PC133 if the specs all matched up, but all it takes is a difference in density to change that. Kingston changed from low to high desity modules without any indication on the modules themselves, I found this out by trying to find compatible modules to a similar motherboard. Call and talk to one of their techs, they will be glad to help, and will be able to determine if you module is compatible or not.
dcc
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