Root login not working

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http://www.linuxforums.org – Hi, I'm completely new to Linux, just installed mandriva 2010 yesterday. I want to install loads of new programmes, codecs etc and I've just figured out that this involves typing commands in the konsole. My problem is that when I type in my administrator password (and I know it's the right one) the query to type in the password reappears, so I do and the query pops up again. I repeated the process a bunch of times then gave up in frustration. Am I doing something wrong or is there something wrong with my pc? Also, does anybody know a good beginners guide for Mandriva and/or linux in general? I really haven't got a clue what I'm doing, Windows is ingrained in my mind. Thanks (HowTos)