Xv under RH 7.3

[Alejandro Perez Mendez <apm1 alu um es>]

Hi, this is th e first time i write into this list. I'm from Spain so I'm sorry because my english.
I have installed my RH 7.3 on my system and all work fine, except when a program (like Xine or mplayer) tries to use Xv extension, then monitor shutdown and keyboard don't work, so I have to restart my computer.
I have an ATI RAGE 128 PF/PRO AGP 4x TMDS with 32 MB, and a LG WS771B monitor.
I tried to execute Xconfigurator but all still on the same way.
I'm very gladed if somebody could help me.
Thanks.