Question : Problem: imac model A1225  Airport card issue unable to use internet

I have another computer right next to it using the same airport express and it works fine... Can I reseat the airport card? if yes How do you get to the card to reseat it?

Answer : Problem: imac model A1225  Airport card issue unable to use internet

See:  http://support.apple.com/kb/TS2220

The users guide that came with your Mac should show you how to reseat the card. If you can't find it see if this helps:  http://manuals.info.apple.com/en_US/iMac_Intel-based_Mid2007_UserGuide.pdf