I can't connect to Internet anymore (WIFI or Ethernet). This was working perfectly before. I don't get a proper IP address from my ADSL box and it seems there is a DNS error when accessing the Internet.

I have an issue with my MacBook pro (MAC OS X 10.8.3) when trying to access Internet. I am behind an ADSL box (Orange). I have a PC on the same LAN which accesses Internet perfectly via the same Box.
On the MAC, I have tried WIFI and Ethernet. And have same issue on both. I have checked the IP address (the ADSL box is a DHCP server) but the MAC doesn't get a proper IP and network mask I tried a manual IP address setup and it doesn't get better. I have setup the DNS servers for my Internet provider, but I get DNS error. I have tried 2 Internet browsers (Chrome and Safari), both have the same issue.
I tried to put my MAC on a different ADSL box (I have 2 acccesses with 2 providers at home) and get the same issue.
I also noticed a havy CPU load on the mDNSResponder process (at least 30%). I have restarted it, but no improvement.
Last, I have repared the permissions.
From those trials, it seems that the problem is on the Mac side. But I am completelly without any new idea, so I need help
Thanks

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, or by a peripheral device.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including Wi-Fi on certain iMacs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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* dimitri
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String m_sBar;
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