Connection timed out on imac now that i have macbook.

i have an imac which used to connect no probs to our wireless router. then i bought a macbook which connects fine but since getting it when i try to connect via airport on the imac it says 'connection timed out'. i have tried turning the macbook off, having out of the room and even out of the house and still the imac wont connect.
help please.

OK, thanks.
Please disable any anti-virus software that you may have running on the iMac.
Check your firewall settings on the iMac as follows:
System Preferences > Security
Click the Firewall tab
Enable all incoming connections
Try to connect. If still no luck...
Temporarily turn off the security setting on your router and see if the iMac can connect that way.

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