The period button on the number pad initiates the shutdown

Welcome Jessica White,

Thank you for reaching out to Microsoft Q&A forum.

I understand how frustrating it can be where pressing the decimal (.) key on the numeric keypad triggers a shutdown is not normal and often points to either a keyboard mapping issue or a stuck modifier key.

Before suggesting more advanced repairs, could you please confirm:

• Are you using a built-in laptop keyboard or an external USB/Bluetooth keyboard?
• Does the problem occur only with the numeric keypad decimal key, or do other keys behave incorrectly as well?

In the meantime, please try these quick checks:

1. Test the key using the Windows On-Screen Keyboard:
   • Press Windows + Ctrl + O to open the On-Screen Keyboard.
   • Enable NumLock if needed and click the numeric keypad decimal key.
   • Check whether it enters a period normally.
2. Check for stuck modifier keys:
   • Press and release Left Alt, Right Alt, Ctrl, and Windows keys several times.
     • Then test the decimal key again.
3. Test in Safe Mode:
   • Open Settings > Update & Security > Recovery
   • Under Advanced startup, select Restart now
   • Go to Troubleshoot > Advanced options > Startup Settings > Restart
   • Select Safe Mode with Networking and test the keypad.
4. If you're using an external keyboard, disconnect it and test with another keyboard if available.

Looking forward to your update.