What wireless protocols are the various devices running? It's possible that the new Mac is running a faster protocol (either g or n) and the router is detecting that and switching to the higher speed mode, leaving it incommunicado as far as the slower devices are concerned. Go into your router and make sure it's set to compatibility mode (something like "b AND g" or "b, g, AND n").
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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