Intel Mac can't see network

My airport extreme network functions well for my Motorola based Macs and windows machines. Suddenly my two intel based machines, a MacBookPro and a MacBook, show no network signal even though the other computers are working fine wirelessly. When I call Apple, I get shuffled between MacBook and Networking people and never get an answer. Any suggestions?

Hi kmacwilliam,
I am having a similar issues with yours, my MBP and MB couldnt not stay connect to the dlink router recently. But the PC's been working fine all the time. The wireless would drop and could not see the network again while my neighbours' networks were still displaying. Even restarting the MBP and router wont see my wireless network.
You can try these things and see if it works for you, it's worked for me for time being. Please post back the outcomes:
1. Delete any airport-related passwords in the "Keychain" so no airport passwords are stored
2. Shut down the iMac
3. Reset the PMU in your case for the G4 iMac, you may need to open your back case to reset it
3. Turn on your iMac and you should see the network again
I am suspecting this might be software issue, hope this works for you.

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