So my ego is bruised more than anything, but aside from that, is there any reviving of a Photon that was briefly connected to 12V on the VIN pin?
@raiderj, you most likely blew the onboard 3.3v switching regulator. You can try powering the Photon directly via the 3V3 pin using a RELIABLE and WELL REGULATED 3.3v power supply 
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Hmm… as a test would a good 3.3V supply be that coming off another Photon? Not sure I have a regulated 3.3V other than that available at the moment.
The max the 3.3v can supply is a 100mA load. The Photon can consume up to 1 A.
Do you have a 2 or 3 AA batteries? You can wire them up and try to hit the 3-3.6v range.
Yup, another Photon doesn’t supply enough current. That didn’t work. I’ll try again with a 3.3V source. Have some stuff around, just have to piece it together. Thanks for the info!