Even with the steps exactly as per the MS article (where you repeatedly hard shut down the PC)?
If you mash delete immediately and continuously as you power the PC on, does the BIOS screen come up
Try shutting the PC down, unplugging it, holding down the power button for 30 seconds, leaving it unplugged for 5 minutes, and then booting it
Unplug the monitor from power and remove the video cable from the graphics card, and leave it for the same time too.
If no luck, you could try clearing the CMOS as per the manual
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