WRT54G - Cannot access internet but iMac airport says internet connection is fine... what's wrong?

I use a WRT54G wireless router connected to Mac. All of a sudden, I became unable to access certain websites on my iMac, such as Facebook and Apple homepages. But i can access Yahoo website. I tried resetting my linksys setup but it doesnt solve the problem. When i access my iphone via wifi at home, i am also unable to go into app store, facebook app, and emails with images won't load. I also cannot link my iphone to itunes on my iMac. What happens on my computer when I surf the internet is that the page just loads halfway and stop "responding". But my imac airport says that my internet connection is fine, however my access has become very "restricted". Can anyone tell me what's happening and how to resolve it?

To resolve difficulties accessing some websites when connected to a Linksys router you should check the following.
Checking the router’s security settings
Checking your computer’s security settings
Security on the web browser is set too high
Configuring the Maximum Transmission Unit (MTU) on the router
Opening ports for secured sites
Here is the link for the same: http://www6.nohold.net/Cisco2/ukp.aspx?pid=93&login=1&vw=1&app=search&articleid=3982&userrole=Linksy...

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10:50 PM Tuesday; May 17, 2011
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WRT54G - Cannot access internet but iMac airport says internet connection is fine... what's wrong?

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