In older Dells, the BIOS password hash was stored on a (Electrically Erasable Programmable Read-Only Memory) chip on the motherboard. To reset it, Dell technicians used a specific memory address write command via a DOS tool called CV.EXE or DellDiag.exe .
User creates a dellbiosreset.iso USB via Rufus, boots from it, sees text “BIOS Reset Successful,” removes USB, reboots — screen lights up, system works. The issue was a corrupted boot order pointing to a nonexistent network drive. dellbiosreset.iso