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I randomly lose internet connection, and cannot reconnect. I either get a no network detected warning or a warning that I do not have wi-fi hardware. The problem might be related to a recent upgrade to Lion.
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Go under the Apple in the upper left hand corner to "about this Mac" > more info > Network > Airport and see if your card is being seen. If not reseat the card, if it still fails, replace the card. Here's how to do it: MacBook Core 2 Duo AirPort Card Replacement
According to which machine you have, here are the cards: Relevant parts
MacBook Core 2 Duo Santa Rosa/Penryn 802.11n Airport Extreme Card
MacBook Core 2 Duo Santa Rosa/Penryn 802.11n Airport Extreme Card
MacBook Core 2 Duo 802.11n Airport Extreme Card
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$49.99
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$19.99
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