IMac Model 10,1 cannot connect to Internet, either with cable modem of Airport. Solutions?

iMac 10,1 cannot connect to internet via cable modem or Airport plugged into cable modem. MacBook Pro, iPad and iPod are fine. Reinstalled OS10.6.3with no results. Ideas on where to go next welcome.

Hello,
Though all of these steps may or may not be needed, I'm including them all.
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
10.5, 10.6, 10.7 & 10.8…
System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.
10.5.x/10.6.x/10.7.x instructions...
System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
The interface that connects to the Internet should be dragged to the top of the list.
If using Wifi/Airport...
Instead of joining your Network from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.
For 10.5/10.6/10.7/10.8, System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add these numbers...
208.67.222.222
208.67.220.220
(There may be better or faster DNS numbers in your area, but these should be a good test).

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...And now it all of a sudden works. However, as I can't delete this post I hope others who have had similar problems may have solutions for future issues.

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Sherya, welcome to the forum.
When requesting help, you should always include the make/model of the computer and/or monitor. This information is necessary for us to review the specifications of them.
I believe that this is a problem for your ISP. Their Customer Service should be able to help you. There may be some settings that can be changed to solve the problem. They would know what the settings should be. I don't believe that it is a hardware problem.
Please click "Accept as Solution" if your problem is solved.
Signature:
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HP 10 Plus; Android-Kit Kat; 1.0 GHz Allwinner A31 ARM Cortex A7 Quad Core Processor ; 2GB RAM Memory Long: 2 GB DDR3L SDRAM (1600MHz); 16GB disable eMMC 16GB v4.51
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Hi all.
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Hi all.
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IMac Model 10,1 cannot connect to Internet, either with cable modem of Airport. Solutions?

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