I'm sorry you're right.With NVIDIARecovery i'm referring to the mac start in safe mode (-s) and type NVIDIARecovery to restore the old drivers.
What is the system definition you are using? The update does specify that it is for a MacPro3,1 or MacPro4,1 or MacPro5,1. Have you tried changing your system definition to one of those?
Is this the proceedure you are referring to on the additional information tab of the driver update page?
http://www.nvidia.com/object/macosx-304.00.00f20-driver.html
To uninstall this driver and restore your original Mac OS X vv10.8.1 driver, follow the steps below:
STEP 1: During the installation process, a backup archive of your current drivers will be created. If for any reason you need to uninstall the 304.00.00f20 driver, the “NVIDIA Driver Restore.mpkg” is located in /Library/Application Support/NVIDIA.
IMPORTANT: Do not move this package from its default location. Doing so will invalidate the uninstall/restore process. Also, this process is only valid with Mac OS X vv10.8.1. Installing any newer version of the OS over this driver will also invalidate the uninstall/restore process.
STEP 2: After locating the NVIDIA Driver Restore.mpkg archive, double-click on the package. You will be guided through the driver restoration process. Click Continue after you read the Welcome screen.
STEP 3: Click Install on the Standard Installer screen. You will be required to enter an Administrator password to continue.
STEP 4: Click Continue Installation on the Warning screen: The Warning screen lets you know that you will need to restart your system once the installation process is complete.
STEP 5: Click Restart on the Installation Completed Successfully screen.
ALTERNATE METHOD – If for any reason you are unable to boot your system to the desktop and wish to restore your original Mac OS X vv10.8.1 driver, you can also do so from “Single-User” mode:
STEP 1: Restart your Macintosh computer and hold down the “Command” (apple) key and the “s” key to boot into “Single User” mode.
STEP 2: When the system finishes loading to a command prompt, type the command “NVIDIARecovery” (no quotation marks), and hit the “Return” key.
STEP 3: The 304.00.00f20 driver will be uninstalled and your original Mac OS X vv10.8.1 driver will be restored. The computer will then reboot automatically.
Now, after starting the mac with -x, i'm unable to launch it normally, but the first two or three times that I start it, it gave me the same mistake that gave me with the previous driver. this is the problem, starting with-v, it loads all the drivers properly then freezes on the white screen with the cursor and the screen flashes every 10 seconds and comes out this inscription at the top of the screen "com.apple.launchd 1 com.apple. coreservices.appleid.authentication 2812 exit timeout elapsed (28 seconds). Killing "
I tried to be as accurate as possible.
P.S. my boot flags are NPCI = 0x3000-v. without them will not start.
Thank u so much
-v is just verbose mode. It has no effect on what happens when you boot, it just lets you know what is happening.
npci=0x3000 is a commonly required boot flag. It is perfectly normal for that to be required.
Have you tried re-installing OSX?