This pattern matches two supported causes in Windows:
- Pointer auto-hide while typing
Windows can hide the pointer while typing. To check that setting:
- Open Settings and search for Mouse settings.
- Select Additional Mouse Settings.
- In Mouse Properties, open Pointer Options.
- Clear Hide pointer while typing.
- Restart the affected app, and if needed restart Windows.
- Display driver or incompatible app behavior
Since the cursor flickers during startup and then disappears, check whether this is part of a broader display issue:
- Press Ctrl + Shift + Esc to open Task Manager.
- If Task Manager flickers along with the rest of the screen, a display driver is the likely cause.
- If Task Manager does not flicker but the rest of the screen does, an incompatible app is the likely cause.
Then try these Windows display steps:
- Press Windows + Ctrl + Shift + B to reset the graphics driver.
- If the issue continues, restart the PC.
- If Windows Update recently changed the display driver, try rolling it back:
- Open Device Manager.
- Expand Display adapters.
- Right-click the adapter > Properties.
- Open the Driver tab.
- Select Roll Back Driver > Yes.
- Restart the device.
- If rollback is unavailable, update the display driver from Device Manager > Display adapters > right-click adapter > Update driver.
- If needed, uninstall the display driver from the same Driver tab and restart so Windows reinstalls it. This can temporarily affect display behavior until the driver is restored.
Because the issue started after enabling Secure Boot, the most relevant supported next step is still to verify whether the problem is actually a display-driver issue using the Task Manager flicker test and then use the driver reset/rollback/update path above.
References:
- Troubleshooting in Windows Terminal
- Mouse Input Overview
- [Windows 11](https://support.microsoft.com/windows/hardware/display-graphics/troubleshoot-screen-flickering-in-windows)
- [Windows 11](https://support.microsoft.com/windows/hardware/display-graphics/troubleshoot-screen-flickering-in-windows#fix-your-display-driver)