Sorry about the problem with your card. That pretty well stinks!To format on the D3100, you go to the little wrench section on the main menu. I believe "format card" is the first item on the sub-menu. To my knowledge there is not a "button" option.
working on it in Middle TNNikon D310035 mm 1.8 Nikkor 18-55 mm Nikkor VR55-200 mm Nikkor VR55-300 mm Nikkor VR150-500 mm Sigma OSFeisol CT3471 & Markins M20 ballhead
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