A fan containing a computer shows that the Mac has created
an ad hoc network, a method of handling Wi-Fi communication
among multiple computers without a base station—not even the
“software” base station that’s created by Internet Sharing. See
Ad Hoc
Networking, in Appendix C.
A fan containing an exclamation point indicates an error in
setting up the network part of the Wi-Fi connection. Although the
computer has connected wirelessly to the base station, it was unable
to obtain a network address. See
Wi-Fi Network Won’t Assign IP
Address.
An empty fan outline indicates that either there’s no Wi-Fi
adapter in the computer, or the Wi-Fi adapter is off. To turn it on,
choose Turn Wi-Fi On from the menu. If the Wi-Fi icon still looks like
an empty fan or an error says that there’s no card or it can’t be turned
on, you may have a hardware problem.
The Eye of Sauron appears in its unblinking form that sees all and
knows all when you use a monitoring mode in Wireless Diagnostics, a
hidden tool that can help you sort through problems. See
Run Wireless
Diagnostics for more details.
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