MacBook can't see wifi network

Hi there,
Please help! I'm setting up a wireless network and my macbook can't see the wireless network.
The bizarre thing is that my friend's macbook sees it and connects with no problem. My macbook sees other wireless networks, but not mine! What's going on?!
I have done the following
- checked that it's turned on. (turned airport off, and back on, and restarted the computer)
- checked that the router is broadcasting the SSID
- checked the network name and password are correctly entered.
- tried entering the name/pwd directly into the "preferred networks" setting of the Network Preferences pane
what else could I do? I'm at a loss.
Please help.
thanks!

Solved my own problem.
Although the wifi router was set to broadcast the SSID (and only one of my macs could see it), I changed the settings so it was NOT broadcasting the SSID, then plugged the appropriate settings into the System Preferences pane, and it worked.
crazy. but it works.

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