After installation of Linux FC 2.6, Monitor displays : exceed frequency limitation

When I install a Linux system of FC 2.6 in a computer which has installed a Windows Xp before. After installation of the Linux and reboot the computer, the monitor displays the information “Exceed Frequency limit” and can’t enter the graphical interface.

So, who know the reason and how to fix it? Please tell me, and thanks in advance.

PS: I use a Quadro FX 5600 card.