Do you know exactly what caused this, particularly if it could have been a region change? This is the most common cause of this sort of issue with the settings, though installation of a bad channel/WAD is usually the cause of the banner brick. If a custom channel was recently installed, I recommend uninstalling it (you can use AnyTitle Deleter, a WAD installer, whatever). However, I doubt that this is the issue.
Try reinstalling the system menu. This is most easily done with
Dop-Mii. Of course, be sure to install the correct system menu for your region (taking into account whether a region change occured; if you want a different region, change it with
AnyRegion Changer). Also, for safety, reinstall the system menu's IOS before installing the system menu (IOS 30 v1040 for system menu 3.2; IOS 60 v6174 for 4.1; IOS 80 for 4.3). As always, do not install 3.2 if you have an "LU64+" wii. If possible, installing Bootmii/boot2 first is advisable.