Hello. Has your Wii been hacked? If yes, have you changed anything before having a black screen? And if it was hacked did you install Priiloader during the hack or even Bootmii in Boot 2?
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If your Wii has been hacked, to find out if Priiloader is installed, turn off your Wii, press the reset button without releasing it and then power. If Priiloader is correctly installed at this time you should arrive on Priiloader. If nothing happens for Priiloader, and to know if Bootmii is in Boot 2, you will have to place the Bootmii folder on an SD card in the SD reader of the Wii that is off and then start. If Bootmii is in boot 2 you will have a menu with 4 icons.