Can't change to 1024 x 768 resolution

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Hello!
 
 
I'm working on a FC2 at 800x600 resolution, with no problems.
 
However, when I change to 1024 x 768 (and restart X by means of logging out), my screen turns black never showing again my login screen (No error messages!).
The only way (afaik) to recover my graphical desktop is to restore xorg.conf (cp /etc/X11/xorg.conf.backup /etc/X11/xorg.conf) and then reboot.
 
I installed my system with an unprobed monitor as FC2 doesn't have my monitor driver:  Philips 105E.
Of course, this monitor setting doesn't allow more than 800x600 resolution so I tried some other Philips monitors and even "Generic CRT Display Monitor 1024x768" always with the named problem.
 
My graphical card shouldn't(?) be the problem as it is a Nvidia GeForce MX 400 (configured as "Nvidia GeForce MX (generic)" by the system) (Should support 1024x768 with 256+ colors!)
 
Other data:
My Kernel version is 2.6.5-1.358 on an i686 but I experienced the same problem with 2.6.7-1.494.2.2
I use Gnome although KDE is also installed.
 
 
Shouldn't, at least, Generic CRT Display Monitor 1024x768 work?
Where can I get a Philips 105E monitor driver? Will this solve my problem?
Can anyone help?
 
 
 
Thanks in advance,
JC

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