Sounds as though your xorg.conf does not contain the correct vertical refresh and horizontal sync information for your monitor. My xorg.conf
Monitor sections looks like this:
Code:
Section "Monitor"
Identifier "Samsung 712N"
VendorName "SAM"
ModelName "SyncMaster"
HorizSync 30-81
VertRefresh 56-75
Option "DPMS"
EndSection
Your Monitor section should look similar. Check online or your monitor user manual for the vertical refresh and horizontal sync specs. Add the specs to your xorg.conf. The HorizSync option is in units of KHz and the VertRefresh option is in units of Hz.
Although many people never have problems installing the proprietary nvidia drivers, like most things with computers, some people do. Therefore, having a Plan B is a good strategy. That means using the standard nv drivers when necessary. The nv driver provides no 3D or direct rendering support, but is useful for getting into X.
To avoid potential issues with the X drivers, I create optional xorg.conf files. I use the proprietary nvidia drivers and I have a two backups for my xorg.conf: 1) xorg.conf.bak and 2) xorg.conf.nvidia. The latter is the master configuration file for the proprietary drivers.
I also have configured the standard nv drivers. Therefore I have an xorg.conf.nv file in /etc/X11.
If I should botch an xorg.conf modification attempt, I can copy the original xorg.conf.nvidia or xorg.conf.bak to xorg.conf and recover my system.
Should I try to update the proprietary nvidia drivers and the install fails, I can temporarily copy xorg.conf.nv to xorg.conf and then I have a way to start X while I troubleshoot, which often includes using a graphical web browser to surf the web.
Consider configuring and installing the standard nv drivers before moving forward with the proprietary nvidia drivers. Then you'll always have a way to get into X. The standard Slackware tools for configuring X with the stock/standard drivers are
xorgconfig and
xorgsetup.
When you are ready to install the nvidia drivers, visit
www.slackbuild.org to download and build the driver and kernel module packages for Slackware. If you want complete packages only, then visit
www.slacky.eu.