majiren,

Here are some more inclusions you can add to that XF86 file, these are in care of Stephen...

XF86Config-4 file, under the same place you changed for your NVidia settings:
Code:
        Option      "IgnoreDisplayDevices"  "DFP, TV"
        Option      "NoBandWidthTest" "1"
the "ignoredisplaydevices" is used to disable the two "other" output connections on the back of the NVidia card, if you dont plan on using the TV OUT, and the other connector ( if your card has them ), and only plan on using the VGA fifteen pin video plug, then add that line...

I am not quite sure what the "nobandwidthtest" is all about, but, my guess, if I recall correctly, you might want this if you are booting off the CD, or possibly if you are using the other two connections - but, I have had the two "options" in the above, in my XF86 file ever since I got my NVidia up and running, and have never had any problems.

Hope this helps,
Ms. Cuddles