How to swop display ports on Windows 10 (when monitor won't connect)?

[Microsoft Windows]

How to swop display ports on Windows 10 (when monitor won't connect)?My PC was connected to a VR headset and I had to set the display port to that of the external VR headset. However, the VR headset has been sold but now when I start up my PC, the monitor will not display - I guess because the settings are set to another external display.So how do I access the PC to set the settings to display my monitor?Is there a start up setting or keyboard trick to revert back to default settings?Thank you.

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