My Screenmonitor blinks

["Gnome Rules" <gnome bilbao com>]

Hi!

I rebooted my Linuxbox (RedHat 7.1) and, after
starting all daemons/services correctly (I
can watch the messages as usually) and when
before login on Gnome, my screen blinks (strange
lines).

I am able to connect it via Telnet. 

How can I configure my Gnome again?

REgards.
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