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Flash rebooting should not affect anything on the phone (unless you factory wipe it by mistake).
It should also not take 120 seconds - more like 10 - 15. From the phone being off - hold the volume down key, then hold the power on key. When it powers on, release the power key, then release the volume down key.
You're probably better off plugging the phone into a PC though, so that you can see what's happening via android bridge. Your battery may be toast though - I've had one Moto G bit the dust before.
Moto G isn't turning on after plugging into a car USB charger. Odd.
I'm going to do the below that I found online.
Does anyone know if going via the flash boot will delete recent photos that hasn't been backed up?
Cheers