MacBook Pro 2010 Can't Connect To Home Wifi

Hey,
My home was setup with a Cisco Linkysys wireless router (about 2 years old) and at the time the iMac that was hardwired to the router and other devices like an iPod/ iPhone and a Nintendo DS etc. would be able to access the home network.  I arrive now (to the parents home) and can't seem to gain access to the network.  I was able to connect once and use the internet but the next day couldn't connect again.  We've confirmed many times the password is correct, reset the linkysys router and tried again but failed.  I would see the router and have full or high signal but upon entering I would get either an "Invalid password" or "Connection timedout" error response.  I also tried Network Diagnostics and Assistant walk throughs under the Assit Me... button but didn't work.  I've also tried choosing the network in Network Preferences under the drop down menu Network Name and entering the password there but to no avail. 
Then recently got another wireless router (Airport Extreme, I figured I we could use another one for the home anyway) yesterday, and did the setup and other devices and the hardwired iMac all can connect and use the internet off of it.  I am currented hardwired to it via ethernet and all though I am right next to the new Apple router, and have full bars, I can't connect.  The most I have gotten was being connected with full bars for a few moments and then the exclamation point coming up in the Airport icon.  BTW, for the past 2 days I have been connecting to free wifi at another public place so I'm really not sure what is going on.  Both networks (the Linksys created one and now the Apple one) are protected via WPA2 Personal.  My notebook is only a year old show that should be fine too, no? 
Any help would be greatly appreciated, I'm at a trouble shooting dead end from my mind's perspective.
Thanks,
Brian

I have the same issue. Was working fine until Saturday when Rogers reset my modem because we lost our internet connection. Our modem is direct connected to our PC and we connec with the Macbook through wifi.
When the modem rebooted we got an IP error and they had to do a renew and release. Since then - no wifi on macbook.
every time we try to join our home network it gives a password wrong error. The password is not wrong. Airport is a solid yellow light. Ethernet is red.
I am not great with macs and I have scoured the net and I cannot figure this out

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