atiato,
i face this problem before. It happends everytime when u think o finstalling Linux, not only for 7.2 Version. You may try to type
$ setup at the console login mode or xconfigurator try one of them. Then at the Menu choose xconfigurator and choose the lowest VGA settings which is compatible with your VGA Card. Also for the Monitor probe, Most likely use the default or just let it be the default. Just play around with the VGA. Choose 800 x 600 , 1024 x *** Etc. It works for me. Im using SIS620 Built in Card and able to detect and play around with it nicely. The /etc/X11/X error refering to teh Xserver doesnt start properly due to mis-selection of VGA Module. Try the suggestion above It might work..