IMac suddenly stopped connecting to the internet

So, I left the room for a while and let the screen saver come up, when I came back it wouldn't connect to the internet with any program (iChat, Safari, Firefox, and Thunderbird).
I connect via ethernet to FiOS but none of the other computers are having trouble connecting.
It's not a connection problem, thankfully. I connected my ethernet cable to a laptop and it connected perfectly.
I ran a diagnostics, however it was essentially useless. It told me that it could not connect to the internet or the server, and to check to make sure that the URL was typed correctly... No websites will load, though.
I did ping my mother's laptop (and my own computer) and it came back fine again, again and again...
In my limited opinion, it has to be some sort of software problem, but this being so all of a sudden bothers me. If I were on a PC I would think virus, but since it's a Mac, this is not likely at all.
Please give me some help and ideas, cause I have run out...
Thanks,
Mike.

I used to have the exact same problem, after I cleared my dns cache and renewed my DHCP license everything worked. Strange thing is that, somehow, someway, by some form of magic this problem stopped happening all together so I never had to continue issuing the command everytime. Could've been due to an update shrug
Type the command below in a terminal. Then renew your DHCP license in Network settings
-> sudo dscacheutil -flushcache

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Imac suddenly stopped connecting to network

sorry if this topic already exists somewhere. i've been searching these forums for an hour and can't find any useful help on the subject.
we bought our first mac almost 1.5 yrs ago. this beautiful 27" imac worked fine for 1 year and then suddenly stopped connecting to our wireless network. distance to the wireless router isn't an issue. doesn't matter where i move it to in the house, it sees the network, but won't connect anymore. 6 other laptops/video game consoles/pc's all continue to connect w/o a problem. this happened once approx 3 months ago and i figured our old router had kicked the bucket, so i bought a new router and it worked fine for several months and now it's happening again.
i've gone thru all the preliminary steps of unplugging the modem, the router, the imac, and renewing the dhcp but nothing helps. it will work fine if i wire it directly to the router, but i don't want to run a 75ft ethernet cable thru the house.
i'm so frustrated with this supposedly wonderful imac! can anyone help me?

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IMac suddenly stopped connecting to the internet

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