Has to do with your hard drive controller , If the Bios was reset it may have defaulted to SATA mode IDE instead of AHCI. See article here:https://www.bleepingcomputer.com/forums/t/602350/pc-wont-boot/ Also what is the service tag of your Dell? Noticed in your screen shot your CPU temp high was 91C, that is too high and indicates a heat sink problem on the CPU, clogged with dust, loose, or bad heat sink compound. Sata settings will be in your BIOS .