Can no longer connect to wifi network

My landlord controls our wifi and I assume he has the router or device somewhere in his apartment, as he lives adjacent to us. I used to be able to connect to our wifi network until yesterday when I came back after being away for a month. I expected this, as he had previously sent an email saying he changed the network password while I was away. When I tried to connect to the network, my MacBook recognized the network and tried to connect. Instead of connecting to the internet, the icon had an exclamation point in it and there was an alert that said something like "unable to connect to the internet." I figured this was because of the new password, so I went into launchpad > keychain access > and deleted the keychain that was attached to the wifi login for that specific network. I tried entering the new password but every time I try it says that I have the wrong password, even though I am 100% sure it is the right one. It still accepts the old password but it doesn't connect. I would normally assume that I'm entering something wrong, but the weird thing is my roommate is able to connect using the new password and my iPhone is also able to still connect, even though I didn't make any changes to the settings (I guess it's still using the old password). Does this make any sense? I can't seem to find any answers.

Try the basics first:
Change your router channel number. Most times this works & is all you have to do.
Disconnect & reconnect your modem. unplug it for about 10 seconds. Plug it back in. Do the same for Apple’s routers. Wait for everything to reboot.
System Preferences>Network
Click the Assist Me button.
In the next window that pops up, click the Diagnostic button & do the necessary.
Research Knowledge Base for network problems that pertain to the OS that is currently installed on your computer. See these basic networking KB Articles: http://support.apple.com/kb/HT1401 AirPort troubleshooting guide
http://support.apple.com/kb/HT4628 Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT2712 Using network locations in Mac OS X
Manually provided DNS server addresses are higher priority than DHCP's
http://support.apple.com/kb/HT1714 Solutions for connecting to the Internet, setting up a small network, and troubleshooting
============================
What to do when you can't connect to the Internet
Also, run the Airport Utility app which is located inside the Utilities folder.
=====================
If using a Linksys router, contact LinkSys Customer Support and/or post in their forums.
If using Apple's Airport, please re-post over in one of the AirPort Forums.

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I never made any claim as to the number of people affected. Besides, even if only 50 people posted messages to this forum, the number of people who do not participate in the Apple forum far outnumber the people who do.
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Greetings,
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Not good politically nevertheless my life is stable, thanks. I'm in Lahore.
It's nice to hear that your internet is up again.
Maliha (I don't work for lenovo)
ThinkPads:- T400[Win 7], T60[Win 7], IBM 240[Win XP]
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Hi everyone.
I have a small network in my home office and as of lately cannot connect on the wireless side for some reason.
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I have a linksys wrt54g router connected to my modem.
I have an Intel MacMini connected to the router via ethernet. I also my G5 connected to the modem via ethernet. Then I have just my MB Pro wit it's APExtreme card to connect anywhere in the house via the wireless portion of the network.
Now, I have always been able to connect to my network. I have simple wep protection and can connect to coffee shop hot spots outside my home (so I know the problem is not in my MB Pro or in the card). It has got to be in the router setup.
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When you restart a wireless network and things seem OK for a time, but the speed slows down after a time and connections become difficult....this is almost always a clear indication that the network is picking up some sort of wireless interference from another source.
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Message was edited by: Bob Timmons

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