[family1232009]

Normal, сброс штатными средствами не помогает (изъятие батарейки, восстановление дефолтных настроек из интерфейса BIOS, постановка джампера)
На англоязычном ресурсе нашёл полезную информацию, завтра буду пробовать

This issue seems to arise after a BIOS update not completely flashing correctly. This leaves the user unable to change the boot device priority in the BIOS, consequently causing the machine to complain there there is 'No Boot Device Available' Upgrading and downgrading the BIOS via standard means doesn't seem to work; however with certain switches it can be done. Firstly, you'll need the first BIOS release, A01 (O755-A01.EXE) Secondly you'll also require the latest BIOS release, A22 (O755-A22.EXE) Finally, you'll need either a USB memory stick or hard disk that is capable of booting the machine into DOS. It is recommended that you use the free tool 'Rufus' to create a FreeDOS bootable memory stick. In addition, you may need to install the service mode jumper on the motherboard; this repair was successfully performed with it enabled, although it *might* work without it installed, although this hasn't been tested. Firstly create a FreeDOS bootable USB device using Rufus. Once complete, copy both the A01 BIOS (O755-A01.EXE) and A22 BIOS (O755-A22.EXE) to the root of the memory stick. Insert the memory stick into the affected computer and press F12 at the BIOS. Boot from the USB stick. Once at the DOS prompt, type: O755-A01 -wipeall -wipeclean Press enter and follow the prompts on screen. After the BIOS has been flashed, the computer should restart. Go into the BIOS and check the Boot Sequence options under System. The boot sequence should now not only display the name of your hard disk, but will also be changeable, allowing your computer to boot normally. Set up your BIOS configuration to your liking (Including setting the date and time) and then Save & Exit. Upon rebooting, press F12 again and once again boot from the USB device. Flash the A22 BIOS the standard way by typing O755-A22 and pressing enter. Follow the onscreen prompts. Once the BIOS has been flashed, check the BIOS settings again to ensure that the Boot Device menu is still accessible. From what I can tell, the earlier BIOS flashing tool includes switches that the later versions do not; -wipeall and -wipeclean are integral to this fix working as they completely erase all BIOS settings that aren't usually erased when the BIOS is updated. For some reason, Dell removed these options from later BIOS update tools. In addition, the earlier BIOS flashing tool actually flashes the BIOS itself under DOS instead of relying on loading the BIOS into RAM and then flashing with routines in the current system BIOS. I've no idea if this makes any difference to the process, but I imagine that it allows for more options to be passed to the flashing routine.

Normal,