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The 'Input Not Supported' message displays on the monitor before Windows even loads, there's not even a bios splash screen.
Learn how to fix Input Signal Out of Range, Change settings to or Change Mode to error on Windows 11/10 using this step-by-step guide.
How do I fix my monitor Input Signal Out of range? To fix a monitor input signal out of range problem adjust the computer’s resolution to a compatible setting with the display.
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