Started PC campaign, not able to shoot, changed bindings and unplugged mouse same problem

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@JAWindrunner wrote:

i went into multi player and it autmatically fired, and reloaded untill all the rounds were gone

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What do you mean it fired and reloaded automatically?  Are you speaking as it is suppossed to shoot or that it shot by itself?  Do you have any additional input devices plugged in such as a speed pad such as a Razer Nostromo, a game pad or joy stick, in addition to your mouse or keyboard?