Can not connect to internet (self-connect or self-detect, i cant remember..

Greeting,
I've a problem regarding getting online. As the title of the subject suggested, i've to delete my AirPort account (which located together with my Bluetooth account) under "network",renew DHCP Lease, create a new account then i can online..
Any idea what's wrong with my Mac?
Any suggestion will be greatly appreciated.
Cheers.

1) When you connect windows computer to the Ethernet port of the router does it works ?
2)When you connect windows computer wirelessly to the router does it works ?
Did you tried giving Static ip address on the Mac computer.

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