Fedora Users — root password problem

I downloaded Fedora Core 2 4 days ago and installed on two machines. I set up Apache, MYSQL, PHP and started playing with them when one of the machines "forgot" the root password. What I mean is that I cannot login as root even tough I am sure I know what the password is. I can login with other I accounts I created but not with the root account anymore. Funny things is that TODAY the other machine had the same problem! I know the password for root and I know I am tipying correctly. I checked that caps lock is not pressed, that the keyboards work... ???

Thanks in advance

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