You mentioned wiimote disconnecting, it's usually a cIOS incorrectly installed. But you said you tried reinstalling cIOS few times so it's less chance to be the issue. it's really strange that wiimote unsync. Black screen could be a lot of different cause, but the wiimote I don't know. For example, you may have accidentally enabled "debug start" option, and it's waiting on a black screen for a debugger tool command to start the game. You want to start over, so : go into USBLoaderGX settings > reset settings. or delete the entire "usbloader_gx" folder and reinstall it again. Be sure to launch it from HBC, or be sure you are using the forwarder and not the full channel (or you'll actually be launching an old version of the loader) if you are on Wii, I'd recommend d2x v8 base57.