There used to be such a list:
Common error messages:
but Apple no longer publish them.
What is the error you are getting, and what version of Mac and OS X are you running?
Thank you for your response. I believe there also was a list from Xupport but I cannot seem to locate it anymore.
Basically an older iMac cannot access my Wi-Fi network although I am entering the correct password. I am currently upgrading it now (after restoring it) from OS 9 to OS X to see if it will work.
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