Prompt for username and password before starting on Fedora 17

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http://forums.fedoraforum.org – I just did a fresh network install of F17 onto an eeePC netbook 1000HE. Grub2 is dual booting it with Windows XP. When the netbook boots to Grub2, I select Fedora (or Windows) and I'm prompted for a username and a password. The only credentials that allow me to proceed are the root creds for the Fedora installation. I have 2 other F17 installations that do not behave this way. Any thoughts on what's going on? (HowTos)