I didn't see the MyLogo2 in the A7N8X, but I didn't look over the BIOS all the well. I have it on my A7V8X so I did some reading in the manual for you, who knows it might help.
It says the MyLogo2 is installed with the ASUS Update. That's how you use it. Bring up ASUS Update, select Update Bios from a file. Specify the location of the BIOS file, click next. Pick your screen, or your own image to become the Logo image. Click next. MyLogo screen will come up & display the image. The next screen prompts you to flash the original BIOS to update it with the new boot logo. When finished, reboot & the new boot logo will show.
The last paragraph is a tip that says:
Instead of starting from ASUS Update, you may also launch ASUS MyLogo2 directly from the Windows Start menu to change your BIOS boot logo. After you have modified the BIOS file with the new logo, use the ASUS Update utility to uplaod the new BIOS into the EEPROM.
Maybe that will help you. It might be there & you not know how to get to it. If it's not, It was wroth your looking, I guess. I would think that it has something in the manual that came with the board. But I do know the manual with the Nforce is half the size of mine with VIA. The manual really sucks to me anyway.
Look over the CD real well also. There's some tabs on the top that take you to utilities. I believe that's where MyLogo2 is on my CD anyway.
Hope that helped you get there for sure. Great Gaming to you!!!
I'm still learning & having fun doing it!! Trouble comes with the things you forget or overlook along the way that make it not so fun!!