Arduino Mega no conecta PC

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hola, tengo un arduino mega (para una impresora 3d) y no soy capaz de conectarlo un pc, no lo detecta, como si no conectase nada. si que se enciende la luz de encendido, pero nada más, probado con diferentes pcs y nada, no detecta el puerto . la primera vez que lo conecté funcionó perfectamente, lo detectó y se instalaron los drivers, ahora nada de nada, ¿estará muerto? ¿habrá alguna manera de revivirlo?

gracias, un saludo.

hola, probaste con otro cable?.


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