re: Issue playing NES games on Retropie

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I did turn shader on. Should I turn it off?

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I would turn shaders off for now while troubleshooting this problem. You want to eliminate as many variables as possible and then, if you get it working again, slowly re-introduce any customizations you want.

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Does it do much?

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Yes, but it depends on how you want the graphics to look. As mentioned, I'm running my Pi on a large, LCD HD TV. Retro games look awful on them and not at all how the original game developers intended. So, the shader I'm using has a slight glow effect, a light scanline, and it smooths out the pixels a bit too without looking blurry.

If you are running your Pi on a standard definition TV, you may not need any shaders at all. It really depends on how you want your games to look. I want my games to look as close to what they looked like at release without running them on an actual CRT.