Mysteriously unable to connect to unprotected wifi network

I recently moved into a new apartment with a wifi network already in place, which I'm currently having trouble connecting to using my 2009 MacBook Pro 15" (OS X 10.6.8).
Everything worked fine for about a week and a half, but last weekend the connection gave out and I haven't been able to reconnect since.  However, what's really baffling to me is that I can still connect with my phone, and my roommate can still connect with his phone and laptop as always.  What's more, I've tried 3 or 4 other wireless networks at friends' apartments or at work and have been able to connect to all of them just fine.
The inconvenient part is that the network is shared with our upstairs neighbors, so I haven't really been able to troubleshoot the modem much other than asking them to restart it once, but I did take my laptop up into their apartment and still was unable to connect to the router, even while standing right over the modem.
My airport card is able to detect the network just fine (it shows as 3-4/5 bars), but when I try to connect it just times out.  I should also mention that it's an open network, so there's no way it could be a password related issue.
So to summarize, this problem only affects my device, and only when I try to connect to my home network.  Any Ideas?

Try the following:
Open System Preferences (gear icon on the dock)
Open Network
Click on AirPort
Click Advanced at the lower right
Locate the name of the open network and click on it it highlight it, then click the - (minus) button at the bottom of the list to delete it
Do the same for any other networks that you no longer need
Click OK, then click Apply
Close the window
Open Macintosh HD > Applications > Utilitites > KeyChain Access
Click on the Kind filter at the top of the area on the right of the window
Look for any listing with the name of the open wireless network
If you find it, click on it to highlight it, then click Delete on your Mac
Close the KeyChain Access windows
Restart your Mac
Try to log on on
What happens?

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