Help to reset monitor resolution?

Greetings,
I have a G5 Quad with an Ati x1900 graphics card running into a 52" Samsung LCD. This was working fine through a dvi-vga adaptor until I switched the monitor resolution from 1920X1080 to 1360X768 which is not supported by the monitor .....blank screen. I plugged another 19" monitor into the other output on the card and both work fine but as soon as I remove the 19" the 52" reverts back to the unsupported mode.
I have reset the pram and tried booting in safe mode but that did not help me.
From bootup the 52" works fine until just before the login screen, then it switches resolution......blank screen.
Would anyone know where these settings would be housed in OS 10.5.1 so I can modify (delete) them?
Any ideas would be much appreciated
Thanks
Gareth

Thanks so much for your help.
Not wishing to play around in single user mode, I opted to delete the files /Library/Preferences/com.apple.windowserver.plist
/Users/username/Library/Preferences/ByHost/Preferences/com.apple.windowserver.xx xx.plist
using my PowerBook over the Firewire with the G5 in target disc mode.
This worked a treat
Thanks again
Gareth

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> Hi all. Just a quick question...hopefully it is in the
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>
> I think I remember reading here a long time ago, that
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> that would have read the monitor resolution and load the
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