Linux 7.1 xfs problems

[Guest_imported]

I have one PC suddenly can not work. When I start the xWins, the screen flash between the xWins and the virtual screen. When I start the text mode, the screen flash between the virtual screen and the text mode. Therefore, I can not type anything on the screen. Why the screen will screen frequently? How can I fix the problems?

Also, when I reboot the PC, the xfs is failed. How can I fix this problems? Can I re-install the xfs's rpm?

Thanks