I had a brief power outage recently, and my Raspberry Pi Zero W did not survive - but the original Raspberry Pi Zero right next to it came through the power bounce without problems! (Power and cable modem internet have been bouncy this month.)
I tried to power it up on two known-good power sources. I tried another micro USB power cable. I didn't see any lights any time I tried, so I thought this Zero W was completely dead.
Then I ran across this suggestion to try a different SD card. Since that's so simple to try, I did, and now my Raspberry Pi Zero W works again! The old SD card spewed errors all over dmesg when I tried to mount it on my computer, so that was definitely the problem.
So now I'll add trying a new SD card to the list with power and cable to get a Raspberry Pi to boot.
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