Go to > Advanced options > Startup Settings > Restart .
Choose . If that doesn't work, select Browse my computer for drivers > Let me pick from a list... and select the "Standard PS/2 Keyboard" model manually.
Legacy ports are often more reliable for accessing firmware settings before the main operating system or USB controllers load.
Ensure the PS/2 controller or legacy ports are explicitly set to . Save changes and exit the BIOS. Step 5: The Ultimate Fail-Safe (USB-to-PS/2 Active Adapter)
Restart your PC and repeatedly press Del , F2 , or F12 to enter the BIOS/UEFI. Navigate to the or Peripherals tab.
Open Registry Editor, navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\i8042prt , and change the Start value from 4 (Disabled) to 1 (Enabled).
When you upgrade to Windows 11, you might find your trusty legacy keyboard stops working. The issue rarely stems from hardware failure. Instead, Windows 11 often disables or misconfigures the i8042prt service, which manages the driver.
Right-click the and choose Update driver . Select Search automatically for drivers .
Enter your BIOS (usually F2, Del, or Esc) and ensure that Legacy USB Support or PS/2 Device Support is enabled. 3. How to Fix/Reinstall Standard PS/2 Keyboard Driver