Check the following:

http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&...

or:

http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&...

Have you already installed the 2 GB?Cause on the link they mentioned 1 GB as the maximum ram size supported for your N100.
Hope it'll help.

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