It's impossible to say without knowing what model system it is, what OS you're running, and exactly what you changed.
You will need to have or make a bootable device (flash drive or CD, system-dependent) and boot the system from it -- reverse whatever change you made, and then restart. That should restore the boot drive to operational status.
ejn63
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Posted May 22nd, 2021 11:00
It's impossible to say without knowing what model system it is, what OS you're running, and exactly what you changed.
You will need to have or make a bootable device (flash drive or CD, system-dependent) and boot the system from it -- reverse whatever change you made, and then restart. That should restore the boot drive to operational status.