The most frequent reason a Nintendo Switch console refuses to turn on or displays a black screen is that the internal lithium-ion battery has become deeply depleted past zero percent, entering a temporary safety lock state that prevents standard wake-up commands. Another extremely common cause is a software freeze occurring during sleep mode, where the operating system crashes in the background. You can troubleshoot power issues easily by testing charging gear. You can verify that your corrective action is successful when connecting the console to an official wall charger for an hour and holding the power button down for fifteen seconds wakes the system up and displays the charging icon.
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