Maybe it's usb port broken
when I connect to computer, its light will turn on for a few seconds and then turn off
Hi @loyio. It is not clear to me: which LED are you referring to? There are several of them on the board:
- A yellow one marked "L"
- A green one marked "ON"
- An unmarked square one that is RGB
Please look for the L light (small orange LED on the left of the Arduino logo).
When pressing the reset button it should blink rapidly for a second. Does this occur?
Can you further explain the "not working" is the board not discovered by the PC? Can't upload? Or does it simply not follow the expected behavior?
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