HT1338 Mac Pro WiFi suddenly states "No hardware installed" but it worked yesterday.

Anybody else seeing this recently?  Hopfully it's not a hardware issue.

All kinds of weird fixes for this issue have been reported, most of which make no sense. I think it's usually or always caused by a hardware fault, which may be intermittent — something like a loose connector or a failed solder joint. Almost anything might seem to fix it, at least temporarily. In some cases, a software or firmware bug may be involved.
The Apple Hardware Test doesn't find anything, as usual.
To rule out everything but a bug or a hardware fault, take each of these steps that you haven't already taken:
1. Make sure all available updates are installed.
2. Reset the NVRAM.
3. Reset the System Management Controller.
4. Boot into Recovery by holding down the key combination command-R at the startup chime. In the OS X Utilities screen, select Get Help Online. A copy of Safari will launch. Test, then reboot as usual.

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