@takero
I write what happened after that.
I bought a 2.5A AC adapter. I replaced it with a 1A adapter, but it didn't work.
However, it works with power supplied from a PC.
@m5stack
I supplied 5v to Ⅿ5 BASIC, but it doesn't work. Why?
I connected + 5.1v to the pin socket battery and connected -t o GND.
Is it not possible to supply power from the pin socket?