When I connect the nano to pc, the led lamp of nano lights normally but computer shows nothing.
What is strange is that I tried nano into another pc and nothing happened at all.
PC do not see arduino at all.
The power LED just confirms the cable provides power. Many Micro and Mini cables are power-only, with no wires for D+ and D-. Either it has a blown Serial to USB chip (unlikely, but possible) or the two cables you tried are power-only (the most common issue.)What does "nothing happened at all" mean? Be specific when describing behavior-explain what you expected to see.The Power LED didn't come on? Further evidence of power-only cables. With nothing to change the impedance on D+ and D- the host may not be turning the port on at all.