Domain User cannot login to Sharepoint 2010

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http://serverfault.com – A new domain user cannot access a Sharepoint intranet site - they keep getting prompted with a login box. Their AD group memberships appear identical to other domain users so I figure this user must need setting up within Sharepoint itself. I added them under Site Settings -> People and Groups -> Team Site Members, however they still cannot login. Can a Sharepoint guru please help me? (HowTos)