Screen goes black during boot

Hi guys,
I've just finished installing Arch for the first time after using Ubuntu until now.
My problem is the when grub starts the boot process the screen goes blank and I can do nothing but restart.
The only way the system boot up is when I add "nomodeset" in the kernel line of grub's entery.
But as the wiki says, while using nomodeset gnome shell only works in fallback mode.
I've got a ATI X800 (R430) which doesn't suporrted by catalyst.
Just for the record, while i was running Ubuntu everything (including full gnome shell) worked as it should with the open source drivers (I've installed xf86-video-ati).
Any suggestions on what can I do to solve this?
Arch is really amazingly fast and I don't want to have to go back to ubuntu. pls help.

vwyodajl wrote:Are you sure you set up your ATI card properly? I have nvidia but generally when I have to use nomodeset is because it is trying to boot into a incorrect video driver. Also it happens for me on new installs untill I get the card properly setup.
HTH
Is there a guide in the wiki for doing this? I've looke at the "ATI" part of the wiki and nothing there seems to help nor show how to config the card.
Jigoku:
I've tried vga=773 even before using nomodeset and it didn't work.
To be more accurate it work for like 3 seconds until the boot process loads somthig like that starts with udev (I don't remember the full name).
But this is not different then when I try to load without "nomodeset".
To sum it all up, I get blank screen (no video signal) always unless I use nomodeset.

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