I tried a ntsc GameCube game via nintendont and a ntsc wii game via usbloadergx and it still has the red screen...
I can't understand, i didn't change any cables or equipment, it changed overnight...
Sorry to tell you, but this seems like a rare hardware-defect.
Your Wii-GPU (WiiU has 2 GPUs, one is for WiiU-mode and one is for Wii-mode) is dying.
And yes. This is common for such GPU-defects.
They typically work on one day and after that day, you come hone, switch on your console (lol) and then it´s dead.
The "Wii GPU" is an ATI Radeon from old days. And these GPUs were common to die overnight. Not just like today, where you have GPU-dying-signs months or weeks before it´s actually dead.
I only know that, when you had the famous "Wii-GPU-death"-sign it meant you get coloured pixels on the screen where they shouldn´t be any.
Check if you have this! If you have it, your Wii-GPU is dead and you no longer can use Wii-games from now on (but your WiiU-GPU is fine and can still play WiiU-games).
You may also try switching your TV to all possible resolutions. If it´s just one resolution that shows such signs it might be a defective/corroding cable.
Exchange that cable and assuming you´re lucky it will work again.
But: If it´s still there with the graphics-issues then your Wii-GPU is DEAD!
Also: I warned others of Hardware-defects on their WiiU when using USB Loader GX!
DO NOT use USB Loader GX in combination when trying to use the PowerPC in vWii-mode or you will FRY your cpu.
So yeah. That´s what most-likely happened with your WiiU if you ask me.
Some other thread here also said he had the problem his "vWii"-mode no longer works. His PPC-cpu seems to be dead.
He can boot up his WiiU-mode fine, but whenever he tries to go into Wii-mode it´s just going black and then restarting!
THIS MEANS your PPC-cpu is dead! And that guy also used USB Loader GX for a very long time...and thought nothing would happen.
And i warned that guy, that he used too much "USB Loader GX", which is DANGEROUS (USB in general is DANGEROUS for PPC-cpus, see Pentium-4-Days, where it also KILLED whole motherboards and cpus!) for the PPC.
Why is USB dangerous and why Nintendo did NOT use USB 3.0 for the WiiU?
Simple: It seems they use the SAME power for the PPC-cpu (15 watts) which is also occupied by the USB-ports.
That is the reason you can KILL your PPC-cpu if you fry your USB-ports. Or yes: You might even kill your Wii-GPU as well. It depends...
If you overload your USB-ports on the back (not on the front!), then you may fry your PPC-cpu (or if it´s not dying, it might at least not be able to be accessed any longer since USB 2.0-backports are ESSENTIAL when you want to access the PowerPC-cpu (this is what happens when you go into Wii-mode, the PPC first checks the USB 2.0-backports).
And 10 years ago, i remember there being a lot of articles saying that because when you use USB 2.0 and load it to the max, you can EASILY kill your cpu and/or your motherboard or your mainboard´s VRM. Because USB 2 is very taxing on the cpu-side and that means the energy has to be there. And if your VRM on the motherboard was too weak and you overloaded it...xD
Remember? PowerPC-cpus do not clock down when they have lower stuff to do. Their energy-management is quite different.
And that means: This is the weak-point of a WiIU. It´s the archilles-heel as you can call it. the USB 2.0-ports. You should NOT overload them (try to put some heavy USB-hdds on there without an own power-delivery!).
You should NOT put 2 HDDs on there. You should not short them. And you should be very careful when using them.
It´s best to not use them at all (i mean if you don´t need them).
Or: If you want max. safety: DO NOT USE USB-memory when accessing the PowerPC-cpu and you are safe from any damage (just install the games directly on the flash-memory, or use the SD-card-method instead!). See? SD-cards are slower...yes. But they are also SAFE and don´t fry your PPC-cpu, it´s VRM (yes, the PPC-cpu has it´s own vrm) or the 2nd GPU of the Wii-side. The WiiU is a complex machine. It consists of many chips and circuits and different VRMs and there are weak points in any machine after all.
If the USB 2.0-port on the back is DEAD your WiiU can no longer access the PowerPC btw.
So yeah. I assume you may have fried your back-usb Ports. You can check that with a volt-meter if you have one. If it gives out 5 volts or nearly 5 volts al is fine but if not...
