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Helpful answers
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Apr 7, 2012 11:40 PM in response to Retiredmacby Kenichi Watanabe,Do you have anything else you can connect to DSL modem's Ethernet port, to test it? Maybe that port is bad, not your iMac's port.
Once all the cables are reconnected Wi-Fi does work.
Does this iMac G4 also have AirPort capability, or are you testing the WiFi with another computer/device?
It may be helpful to know some more details. What specific model is this iMac G4? You can look at this list to find your specific model
http://www.everymac.com/systems/apple/imac/index-imac.html
What version of Mac OS X does it run?
is Ethernet on a card or part of a chip?
I believe the Ethernet components are part of the motherboard. It is probably not worth the cost of repair, if it is broken.
You can try some basic troubleshooting steps...
First, make sure you have completely shut down (powered OFF) the iMac and started it back up, since this problem occurred.
Second, try resetting PRAM
http://support.apple.com/kb/ht1379
Third, try resetting PMU (power management)
http://support.apple.com/kb/HT1712
When you do this, if the iMac had been plugged into an old (or overcrowded) power strip (surge suppressor), connect it directly to a wall outlet.