Mac can't connect to the Internet but iPad can

I'm having trouble getting my Mac to connect to the net.   Tried restarting both my modem and Apple router.   Also tried with wired and wireless connection.   No dice.   Anyone offer any suggestions.   Oh, I'm running the latest OSX -10.8.

I have been having problems with various computers not pulling DNS settings properly. The only way I can get them to reconnect to the Internet is by manually removing the DNS servers from the Network system preference. I am assuming you are using DHCP on your router.
Go to the System Preferences, then choose Network. Make sure the lock in the bottom right hand corner is unlocked. Select the interface you want to use, ie. Ethernet or wi-fi. Click the Advanced button. Select the DNS tab and make sure there aren't any manual entries in there. If there are, click on them and hit the minus button in the bottom left hand corner. Apply the changes and hopefully it comes right back.
I have had to continually redo this process on laptops, though. I haven't figured out how to make the change stay, I think it's some sort of corrupted preference or maybe permissions problem.
Hope it helps...

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