My sword looks fine in solid view, but when I go into rendered view, it turns completely black.
I have mipmaps off, texture solid on.
It looks fine in solid view:
But when I switch to rendered view, the sword is entirely grey.
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Your issue is that you don't have any lamps in your scene.
To add a lamp, you can press SHIFTA to go to the add menu. Then go to lamp drop down, and select point. This will add a point light which casts light in all directions. After you add your light, just position it until it lights your sword well.