Wii virtual console nes games not showing picture?

I'm trying to play nes games like super mario brothers 3 and super mario bros. on my Wii which I purchased online through the Wii's virtual console store. But everytime I try and play one of them the screen goes black and there's no sound. I press the home button and I can see the game running in the... show more I'm trying to play nes games like super mario brothers 3 and super mario bros. on my Wii which I purchased online through the Wii's virtual console store. But everytime I try and play one of them the screen goes black and there's no sound. I press the home button and I can see the game running in the background but when I return to try and play the game it just goes black again. Can anyone tell me why it's doing this and how I can fix it. Thanks.
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