There is no traditional user manual for this model:
http://support.lenovo.com/en_US/guides-and-manuals/detail.page?DocID=UM002042
Service and Troubleshooting guide
http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/92p2196.pdf
Hardware Service Manual:
http://tim.id.au/laptops/lenovo/thinkpad%20g40%20g41.pdf
Also check out this site for great info on Thinkpads:
http://www.thinkwiki.org/wiki/Category:G41
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