It probably says you bricked your wii, in Chinese, well probably Japanesse. We usually have three options, lets see if any will work for you. If they don't, there is nothing you can do.
Option 1- Boot2 bootmii, can be used to repair the wii system. If you have it installed you should see two flashed from the blue led drive light at boot with disk removed.
Option 2- Preloader, this can be used to load a variety of apps, which would allow you to fix the wii. It is accessed by holding reset and booting the wii. It sounds like you don't have this as it would have been removed with a custom menu install.
Option 3- Recovery mode. You may be able to boot the wii's recovery mode via savemiifrii. You need a gc controller modified to allow all four directionals to be pushed at the same time. Plug the gc controller into the 4th port, hold all four directions down and boot. You should see a black screen with your system menu version in the lower right corner, probably in Japanese in your case.
Give that a try, if any of those are functioning let me know and we can begin the painful process of recovery. If not, go buy a new wii, buy new mainboard, or send it in to Nintendo for a large lump sum.