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I shut my RPi3 Model 3B+ down earlier with sudo shutdown now, and while it was shutdown, but not disconnected, we had a power outage. When the power came back on, the Pi would not start.
The red power light is coming on, but the ACT light is not coming on at all.
I think it might be done for - can anyone help?
If you want to fault find see The Boot Problems Sticky
It is possible, but unlikely, that the Pi "might be done for" but it is far more likely that the OS file system is damaged.
I suggest you restore from your backup.
It is possible that the SD Card is damaged/worn out but even this is not likely.
You could try a e2fsck -f <device> file system check on the SD card on your PC
