Hello Paul T,
Thank you for reaching out to Microsoft Q&A and informed us about the issue. From your description, I believed that the problems could be causing by a hardware-related issue and here's some troubleshooting steps that you can try:
1. Basic checks:
- Restart your PC, this can often fix temporary glitches
- Clean your keyboard, make sure no dust or lint stuck inside and check for any sticky keys
2. Check for Driver updates:
- Open Device Manager (Right-Click Start button on the bottom task bar) > Keyboard > Right-click your Keyboard device > Update driver > Search automatically for drivers
3. Disable Accessibility:
- Open Windows Settings > Accessibility > Keyboard >Disable Sticky keys and Filter keys
4. Test in Safe Mode:
- Open Run dialogue (Windows +R) then input msconfig > Enter (you can enable on screen keyboard for this step if the "O" key still malfunction) > Boot tab > Safe boot > OK
- Test the keyboard, if the keyboard working fine perhaps a third-party app or a driver may cause the issue
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