I'm not sure that my suggestions will be any different than they were toward the end of the other thread:
viewtopic.php?t=358&postdays=0&postorder=asc&start=0
I don't do anything different than you have done and mine works. I don't have the same card and haven't seen anyone else with this problem. That's pretty much why I suggested you ask this question on that nVidia forum that I linked to in the above thread:
http://www.nvnews.net/vbulletin/forumdi ... forumid=14
[edit]
After searching the above forums very briefly I found a thread with people who have a similar problem as you are having:
http://www.nvnews.net/vbulletin/showthr ... adid=10856
I am willing to bet with a little more searching you will find several related threads. If it happened to me I would suspect a hardware issue and not a driver/configuration problem but that's just me. The above thread mentions a problem with BIOS versions on some main boards causing a problem. And it can be a problem that you might see in Linux bot not on Windows.
You also might want to take the suggestion in that thread for getting more debugging info by adding some params to the "startx" command:
$ startx -- -verbose 5 -logverbose 5
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