Sister-in-law has a Dell Inspiron 5680 that seems to have bricked after a bad BIOS update. The system is an i7-8700 with 1x8GB DDR4 RAM (SK Hynix 2400 MHz), 128GB M.2 SSD (SATA, SK Hynix), 1TB HDD, ...
Even if your PC seems to be working fine, you should still update the BIOS.