arre you isntalling your autoboots into usb? or just using the ploggys fowarder and booting games in the sd?
I use a forwarder (Possibly ploggy's, unsure where it originates from) and it's installed to the system storage. Originally I had two of these, one installed on system and one on USB HDD. So I deleted the one from USB, then I turned off the system and unplugged the HDD along with it's USB's. I tried the Ninendont forwarder with no HDD plugged in and still black screened surprisingly. The gamecube files and backups are on the SD card and work normally in vWii as they've always have.
As far as weird stuff I've done in vWii different from others, was installing a custom theme and installing the unreleased version of HBC (1.1.3) which has native widescreen support. So I went ahead and deleted that HBC and installed the usual one with wuphax. And restored the stock vWii theme. Neither of these have been able to fix the blackscreen issue.
So I went and tried a GC inject, Animal Crossing since its 36 MB. I installed it to USB and tried it out, and black screen.
Next im going to try using Nintendont version from September 16th when people first started using Nintendont on the gamepad, to see if it boots up. Then, I'm going to try installing a Nintendont forwarder in vWii. I'll move Animal Crossing to system storage before testing again and disconnect the USB.
I'm afraid my problem is so bad and hard to troubleshoot, that I need to make an even more detailed post than this. But thanks for the concern, I always appreciate your replies. I even found you on Google helping someone else troubleshoot something on github : p