Hello, I have installed SL 10.6.8 fine, but the wi-fi isn't working on it. When I open System Preferences < Network it says cable unplugged. So, one day I opened the Dell latitude d620 up, and the Broadcom 1490 WAS plugged in. Not sure whats wrong. Ive done a truckload of research and still nothing. Please help as quick ASAP.