Hello! It sounds like you are experiencing a frustrating issue with your keyboard where pressing the backspace key types the number 9 instead of deleting characters. Additionally, it seems that the letter U is also affected by this issue, acting as a shortcut to the display settings.
Here are some suggestions to troubleshoot and potentially fix this problem:
1. Check Keyboard Settings: Verify that your keyboard settings are configured correctly. Sometimes, accidental changes in settings can cause such issues. Go to your computer's control panel or settings and check the keyboard settings.
2. Update Drivers: Ensure that your keyboard drivers are up to date. Outdated drivers sometimes cause unexpected behavior. You can update your drivers through the Device Manager on Windows or System Preferences on macOS.
3. Check for Physical Damage: Inspect your keyboard for any physical damage or debris that may be causing these issues. Clean the keyboard and ensure that all keys are functioning properly.
4. Try Another Keyboard: If possible, test with another keyboard to see if the issue persists. This can help determine if the problem lies with the keyboard itself or with the computer settings.
5. Restart Your Computer: Sometimes, a simple restart can resolve minor software glitches causing keyboard issues.
6. Disable Keyboard Shortcuts: If the letter U is triggering a shortcut to display settings, you might want to check your keyboard shortcuts settings and disable any unwanted shortcuts that could be causing this behavior.
7. Check Accessibility Settings: Some accessibility settings can cause unexpected keyboard behavior. Make sure that no accessibility features are enabled that could be interfering with normal keyboard functions.
If none of the above suggestions work, please provide more details about your operating system (Windows, macOS, etc.) and the type of keyboard you are using for further assistance.