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6300 Pro SFF doesn't start after I've changed the Boot Order

6300 Pro SFF
Microsoft Windows 10 (64-bit)

Goodevening to everybody.

I've got a personal computer HP Compaq 6300 Pro SFF and today I've changed the Boot Order in its BIOS from "UEFI Boot Sources" to "Legacy Boot Scources".
After that I've saved these changes, at following restart, the monitor hasn't switched on again since following restart.
In particular, when I start my PC:
the LEDs light up as usual
the monitor is off
and, then 30-40 seconds, the fans start at maximum speed.

Thanks to all those who will know how to help me.

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