Can't install Windows - getting a black screen when PC restarts as part of the install procedure

[it's ok thnx 📎]

My PC has been having black screen - 'No Display' issue when I try to boot or restart. I use a DisplayPort cable to a fairly new monitor.If I try to install Windows via a Windows boot USB, the PC black screens when the install procedure tries to restart - so the process is unsuccessful. I have to hard shutdown with the power button.The only way I can get out of this is to turn the PC off completely, then press the Clear CMOS button on the motherboard, then turn back on and start with a Windows boot USB plugged in, then choose the USB as the boot device in the BIOS. From that I can only really

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