Read /usr/ports/Updating to see the steps for 
getting the new Nividia driver to work with Xorg 7.3


X -configure
# cd /usr/ports/x11-drivers/xorg-drivers
 # make config
Are the relevant items for mouse, keyboard and the nv driver checked?
If not, check them and try reinstalling the drivers package

nvidia-xconfig

Nvidia drivers are just not compatible with xorg 7.3, start your x11 server like that:

Code:
X -ignoreABI
As robbak asked: "What errors??"

Try also increasing the verbosity level starting xorg with startx -- -logverbose 5 if you are using a 
driver compiled for xorg-7.3, else use startx -- -ignoreABI -logverbose 5

So, yes, this is annoying. Blame Nvidia for keeping their drivers
proprietary. The answer is to suport ATI now that they have relased
proper device specs and are actively developing and supporting the
development of fully open drivers.

And exactly what is - exactly - the model? Being a geforce 7 you
probably have to install the 100.14.19 or 96.43.01 driver
(x11/nvidia-driver, x11/nvidia-driver-96xx) and not the
71.86.01(x11/nvidia-driver-71xx).

Check the supported gpus on the various readme.

You gpu is supported by 100.14.19.
zzzzzzz
Make sure you ports tree is updated using cvup or portsnap. Run
Code: 
pkg_delete nvidia-driver-71xx
pkg_delete nvidia-driver-71xx
pkg_delete nvidia-driver
portupgrade -f x11-servers/xorg-server
portinstall -f x11/nvidia-driver
Then
Code:
cd
Xorg -configure
cat xorg.conf.new | grep -v dri | sed 's/GLCore/glx/' | sed 's/nv/nvidia/' > xorg.conf.nvidia
startx -- -config xorg.conf.nvidia -logverbose 6


zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
psychonics: You will be please to hear that your log file indicates that there is nothing wrong. The only error is that you seem to be still using the nv (open-source, 2d) driver, which causes problems with the nvidia GLX extensions. This is fixed by making sure that you have the current nvidia-driver port installed (not the 71xx or 74xx ports: these are for older graphics cards not supported by the current one), and editing your /etc/X11/xorg.conf file (scroll down until you find Section "Device", and change driver "nv" to driver "nvidia")

If that doesn't work, please post both your /etc/x11/xorg.conf file and the new /var/log/xorg.0.log . Yes, you will have to rename them .txt before the uploader will accept them. Don't rename them to .zip unless they are actually .zip files.

well I cannot upgrade /nvidia-driver/ because I have _7 sources and
am running _6, but in my notes these are things to check (note there are
probably an infinite combination of the following)
.................................................
keep agp_load="YES" along with the nvidia one
compile the port with just ACPI and FreebsdAGP checked (uncheck linux)
use "Option "NvAGP" "1" (or) NvAGP "3" (i don't have the case or spelling handy)
install mesa-demos before /nvidia*
(forums.nvidia.com)
grabnotes.com/gentoo/xorg.html
comiz.org/nvidia
docs.pclinuxos. /XorgConf
...................

unix# cd /usr/ports/x11/nvidia-driver
unix# make && make install

Code: 
pkg_delete nvidia-driver-71xx
pkg_delete nvidia-driver-71xx
pkg_delete nvidia-driver
portupgrade -f x11-servers/xorg-server
portinstall -f x11/nvidia-driver
Then
Code:
cd
Xorg -configure
cat xorg.conf.new | grep -v dri | sed 's/GLCore/glx/' | sed 's/nv/nvidia/' > xorg.conf.nvidia
startx -- -config xorg.conf.nvidia -logverbose 6


zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
psychonics: You will be please to hear that your log file indicates that there is nothing wrong. The only error is that you seem to be still using the nv (open-source, 2d) driver, which causes problems with the nvidia GLX extensions. This is fixed by making sure that you have the current nvidia-driver port installed (not the 71xx or 74xx ports: these are for older graphics cards not supported by the current one), and editing your /etc/X11/xorg.conf file (scroll down until you find Section "Device", and change driver "nv" to driver "nvidia")

If that doesn't work, please post both your /etc/x11/xorg.conf file and the new /var/log/xorg.0.log . Yes, you will have to rename them .txt before the uploader will accept them. Don't rename them to .zip unless they are actually .zip files.

well I cannot upgrade /nvidia-driver/ because I have _7 sources and
am running _6, but in my notes these are things to check (note there are
probably an infinite combination of the following)
.................................................
keep agp_load="YES" along with the nvidia one
compile the port with just ACPI and FreebsdAGP checked (uncheck linux)
use "Option "NvAGP" "1" (or) NvAGP "3" (i don't have the case or spelling handy)
install mesa-demos before /nvidia*
(forums.nvidia.com)
grabnotes.com/gentoo/xorg.html
comiz.org/nvidia
docs.pclinuxos. /XorgConf
...................

unix# cd /usr/ports/x11/nvidia-driver
unix# make && make install


To use these drivers, make sure that you have loaded the nvidia kernel
module, by doing

        # kldload nvidia

or adding

        nvidia_load="YES"

to your /boot/loader.conf.

If you build this port with WITH_FREEBSD_AGP=yes, make sure you have
agp.ko kernel module compiled and installed, since nvidia.ko will
depend on it, or have your kernel compiled with "device agp".  Other-
wise the nvidia kernel module will not load.  Also, care to specify
correct ``Option "NvAGP"'' in ``Device'' section of your X11 configu-
ration file.

When building with Linux compatibility (WITH_LINUX=yes), make sure
linux.ko is available as well (or have it compiled in kernel).  It can
be loaded via /boot/loader.conf (or later in boot process if you add

        linux_enable="YES"

to your /etc/rc.conf.

Note that this driver does not support PAE-enabled kernels.

If X.org cannot start and reports

        (EE) NVIDIA(0): Failed to obtain a shared memory identifier.

in /var/log/Xorg.0.log while actually you have ``options SYSVSHM''
enabled in kernel, the sysctl ``kern.ipc.shmall'' should be increased.

See /usr/local/share/doc/NVIDIA_GLX-1.0/README for more information.

===>   Running ldconfig
/sbin/ldconfig -m /usr/local/lib
===>   Registering installation for nvidia-driver-100.14.19
unix#

You seem to have worked around it, which is OK. If you continue to have problems, though, delete bsd.port.mk and let csup or portsnap recreate it for you.