It is a common hardware error amog thinkpad T30. more info here: http://forums.lenovo.com/lnv/board/message?board.id=T_Series_Thinkpads&message.id=21253
Make sure you got same model/type for both of the memory modules.
Also they must have same clock even most of the time you can still install different clocked modules (but both will works at the lowest clock of one of the modules).
But it will not hurt if you try this :
If your notebook reads both of the modules it means both of your modules are ok and your notebook slot 1 is OK. Repeat the step above in your notebook memory slot 2 to make sure slot 2 is OK too.
Now to eliminate problems, clean up your memory module's copper contact.
Next install both of the modules in each memory slot on your notebook and see if the modules can be detected.
If it's still not works, try to switch the modules position each other in your notebook slot and again turn on the computer to see if it works.
If it's not working then it's most likely that your modules aren't compatible each other.
Check both RAM on by one
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check both RAM on by one , what does this mean?
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