Try installing your personal Wii/GC injection to your System NAND instead of your external USB HDD to test to see if your HDD is the issue. Even though the HDD works fine with WiiU games, the common issue is when the Wii/GC injects boots into vWii mode to launch the game, this is when some types of ext USB HDD does not initiate in time for the game to load in vWii, it's an issue in vWii on how it handles ext USB HDD's.

If you decide to test by installing the Wii/GC game on your System NAND, it's a good idea to disconnect your ext USB HDD and have nothing connected in any of the USB ports.
Be warned though, disconnecting your ext USB HDD, will reset all the game sorting that you have done on your WiiU, if you have a lot of games, neatly sorted in folders, you will have to do it all over again.

Another alternative method that some people did to get Wii/GC injects working is, first boot into vWii, then exit back to the WiiU menu and try booting the Wii/GC inject.

 

I got my games working by running nintendont in vWii and starting a game, after that all games will work. The only thing is that the black screen returns after I install a new game with wupinstaller, which is easily solved by repeating the same method.

 

I've had this problem recently, what I did was start Nintendont alone, was granted with a stuck progress bar, I downloaded the last version and copied it on my SD, everytime I used any tools to do that (Wii U USB Helper or WiiVC Injection Script) it was not working.

I then changed the parameters and updated everything from Nintendont directly (Nintendont, controllers.zip titles etc...) and it now works flawlessly.

 

For me Wii VC injects work fine with gamepad support and everything, but I've spent hours and hours trying to get Gamecube working past the black screen.
The strange thing is, Gamecube VC's will boot nintendont properly if I disable gamepad support. I just don't have any controller that I can use for that.
All I want is to play Gamecube games in bed with the gamepad screen :'( Then my Wii U will finally be complete.

 

are the injection the same region as your console.had the same issue when i used a different region.every injection is on my ext hdd .only thing different is that my vwii isn't hacked.whith wii games the gamepad always turns off,that's normal but the the should display it.did you try with de default options in techmoon for wii?for gamecube make sure the nintendont file is setup properly

 

https://www.google.com/search?q=gam...d=chrome-mobile&ie=UTF-8#imgrc=Zy-BM2UCKWWreM:
Check it out Maybe it wil help you

 

UPDATE

I had about 30 mins to myself yesterday and installed my test images to the NAND and guess what it worked, well kind of. Only 2 issues, both user inflicted. I screwed up my Wii inject as the gamepad wouldn't work and I didn't have Nintendont in the right folder. I had it in SD/wiiu/apps and after some research, I think it should be in SD/apps. I may have time again tonight to continue tinkering. I love this shit .

 

No way, that would be way too easy! Actually, I did that and like a fool moved it to the wii/apps folder.

 

something new here?