When powered on, your Wii displays nothing but an error message, or nothing at all? We may have just the solution for your problem. There's a good chance a nifty little piece of hardware can allow you to fix your system. We call it SaveMii.
Most “bricks” are the result of poor error checking or bugs in the Wii's System Menu. For example, if you have installed a system update off a wrong region's disk, the System Menu will only display an “Opera” error message and halt without running disks anymore. SaveMii will let you break out of this condition.
SaveMii allows to skip most of the System Menu startup process, especially the part that fails and halts the boot process. Instead, it causes the Wii to directly run software off a disk. Depending on the Wii's system version, and whether your Wii has a modchip installed, this allows you to either run a system update off a legit Wii disk, or a custom-made disk containing updates or homebrew tools.