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..we've tried reinstalling all audio codecs, different sound cards as well as differnet CD drives. It plays DVD's fine including their audio, it plays all other audio files, it just will not play audio CD files (CDA)?
I have also tried other players besides media player with the same results
So you already tried Noo's last suggestion 'near enough' ..
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Windows Media Player checks for an echo from the default gateway. If there is no IP gateway, Windows Media Player may try to ping the HTTP proxy instead. If the HTTP proxy is outside your firewall and the firewall filters ICMP packets, Windows Media Player may determine that there is no connection.
that's from