When you press Ctrl+F12 and nothing happens, it could be due to a few reasons:
Keyboard Shortcut Conflict: Ctrl+F12 might be assigned to another function or action in the specific software or application you are using. In some cases, certain software or browser extensions can override or modify default keyboard shortcuts. Try using a different combination of keys or check the software's documentation for the correct shortcut.
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Hardware or Driver Issue: There could be an issue with your keyboard or its drivers. Try using a different keyboard or connecting your current keyboard to another computer to see if the issue persists. If the problem is specific to your keyboard, you may need to troubleshoot or replace it.
Software-Specific Function: Ctrl+F12 might not have any predefined function in the software or application you are using. It's possible that the specific software or context you are in does not respond to that particular keyboard combination.
Operating System Settings: Some operating systems, such as Windows or macOS, allow you to customize keyboard shortcuts or assign specific functions to certain key combinations. Check your operating system's settings to ensure there are no conflicts or modifications made to the default keyboard shortcuts.