I'm with Finnegan regarding your battery terminals/connections. If the starter's high amperage requirements knock everything off when the key was turned to start, it usually points to either loose connections or corrosion (and it can be unseen corrosion).
Remove your battery connections - the negative first then positive. Clean both the connections and the battery terminals with a wire brush. Reconnect the positive terminal first followed by the negative and you should be good to go (if not it's new battery time).
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