MacBook no longer connects -- need help!

Forgive me if this has been asked before, but as I was scrolling through posts, I found similar problems that didn't quite apply, but nothing identical.
I bought a MacBook 1.5-2 months ago. Had some initial troubles connecting to my home network, but once I switched protection from WEP to WPA everything has been running fine. Yesterday morning I had to reboot my cable modem, which runs into a Netgear WGR614 v8. That night, when I went to connect via the new MacBook, I got the error that airport could not connect to my network, please try again.
My hardwired G5 Tower connects via the router no problem, and my wife's iBook connects wirelessly no problem. The MacBook was able to connect to someone else's unprotected network no problem, so I know the card in it is still good, as is the router. I checked and the right password was still being remembered.
Any ideas?

Have you tried adding your home wireless network as a "Preferred Network" in your MacBook's AirPort settings?
o System Preferences > Network > Show > AirPort

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MacBook (13-inch, Aluminum, Late 2008) and MacBook Pro (15-inch, Late 2008)- What to do if migration is unsuccessful;
MacBook Air- Migration Tips and Tricks;
MacBook Air- Remote Disc, Migration, or Remote Install Mac OS X and wireless 802.11n networks.
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In your /Home/ folder: Documents, Movies, Music, Pictures, and Sites folders.
In your /Home/Library/ folder:
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/Home/Library/Application Support/iCal (copy the whole folder)
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/Home/Library/Keychains (copy the whole folder)
/Home/Library/Mail (copy the whole folder)
/Home/Library/Preferences/ (copy the whole folder)
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/Home /Library/iTunes (copy the whole folder)
/Home /Library/Safari (copy the whole folder)
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/Home/Library/Application Support/WebFoundation/HTTPCookies.plist
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Credit goes to Macjack for this information.
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Written by Kappy with additional contributions from a brody.
Revised 1/6/2009
Message was edited by: Kappy

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The iMac I conferenced with is my mother-in-law's, and my computer will be left with my mom when I move away in the near future (I just joined the Navy). All I'll need is a new iMac and a decent ISP, then my mom and my kids will be able to use iChat. If my mother-in-law wants to shell out an extra $14/mo. on her cable bill for better connection speed, that's her perogative, ha ha.
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