Fixing a no bootable device error when starting your computer

A “no bootable device” message means the computer cannot find a drive containing a usable operating system. Instead of loading Windows, it may display wording such as “No bootable device found”, “Operating system not found”, or “Insert boot media and press any key”. The problem can be caused by a simple BIOS setting, a disconnected drive, damaged startup files, or a failing SSD. Learn more about экономия на электроэнергии за счет ночного тарифа как настроить майнинг.

The error often appears after a Windows update, a BIOS reset, a hardware upgrade, or an interrupted repair. It can also follow a flat CMOS battery, a loose SATA cable, or an accidental change to the boot priority. Before making changes, disconnect USB sticks, external hard drives, memory cards, and DVDs, because the firmware may be trying to start from the wrong device.

Care is important when valuable files are stored on the computer. Repeatedly reinstalling Windows or formatting a disk can make recovery harder. If the computer contains work records, family photos, tax documents, or business data, begin with non-destructive checks and consider professional assistance before using advanced recovery commands.

Check simple connections first

Turn the computer off completely, remove the power cable, and hold the power button for several seconds. A desktop PC should be opened only when it is safe to do so and after static electricity has been discharged. Check that the SSD or hard drive is firmly connected. On a desktop, inspect both the data cable and the power connector. A laptop drive may be seated under a removable access panel, although many newer models use a sealed chassis.

Remove every non-essential USB device and start the computer again. A faulty USB stick can sometimes appear before the internal drive in the startup sequence. Also check whether a recently connected external drive, docking station, or memory card is causing unusual behaviour. If the error began after moving a computer between rooms in a Sydney or Melbourne home office, a disturbed cable or connector is more likely than a sudden Windows software fault.

Listen and observe during startup. Clicking, repeated spin-up sounds, a drive that disappears intermittently, or a completely silent mechanical disk can indicate hardware trouble. SSDs usually fail silently, so the absence of noise does not prove that the storage device is healthy.

Confirm whether the drive appears in firmware

Enter the BIOS or UEFI setup by pressing the manufacturer’s key during startup. Common keys include F2, Delete, Esc, and F10, but the correct key varies by computer. Look for menus named Storage, System Information, Boot, or NVMe Configuration. The internal drive should appear with a model number and capacity.

If the drive is listed, check that Windows Boot Manager or the correct internal disk is the first boot option. On a UEFI computer, Windows Boot Manager is generally preferable to a generic drive entry. Save changes and restart. Avoid changing SATA mode between AHCI, RAID, and other options unless you know the original configuration, because an incorrect mode can stop Windows from loading.

If the drive is missing from firmware, Windows repair tools will usually not solve the underlying issue. Reseat the drive, test another cable or port on a desktop, and check whether the drive is detected in another compatible computer. A missing drive may have failed or may require specialist diagnostics. Do not initialise or format it simply because another computer displays a message asking you to do so.

Repair startup files safely

When the drive is detected but Windows does not start, use a Windows installation USB or recovery drive. Boot from that media, choose the language and keyboard layout, and select Repair your computer rather than Install now. Open Troubleshoot and try Startup Repair first. This automated tool can rebuild some boot information without deleting personal files.

If Startup Repair fails, System Restore may reverse a recent driver or system change. It does not normally remove personal documents, although applications and updates installed after the chosen restore point may be affected. Microsoft’s recovery environment also provides Command Prompt tools, but commands such as bootrec, bcdboot, and diskpart must be used carefully. Selecting the wrong disk or partition can cause permanent data loss.

A recent hardware or driver change can also be relevant. For background on handling a problematic device driver, see these driver rollback notes before replacing or removing drivers unnecessarily. If BitLocker encryption is enabled, recovery tools may request the BitLocker recovery key, which is often stored in the user’s Microsoft account or with the organisation that manages the PC.

Look for signs of drive failure

A drive that appears in BIOS but vanishes during recovery is suspicious. Other warning signs include extremely slow file access, Windows freezing during startup, corrupted filenames, repeated blue-screen errors, and a repair process that cannot read the Windows partition. A hard drive with bad sectors can produce a boot error even when some files remain accessible.

If the disk is still readable, copy important files before attempting extensive repairs. Use another computer, a bootable Linux environment, or a professional data recovery service if Windows will not load. Copy files to a separate drive rather than moving them, and avoid running disk-cleaning, defragmentation, or “optimisation” utilities on a failing disk.

Replacement is often the practical solution for an old mechanical hard drive or an unreliable SSD. A new SSD can improve startup speed and responsiveness, but it should be installed only after checking the interface, physical size, capacity, and encryption requirements. In Australia, local computer retailers and repair shops in Brisbane, Perth, Adelaide, and other cities may offer installation and cloning services, but confirm whether the quotation includes a genuine Windows licence and data transfer.

Consider recent updates and configuration changes

A BIOS or UEFI update can reset boot order, secure boot settings, or storage configuration. It may also expose an older operating system installation that was already near failure. Record the current firmware settings before changing them. If the problem started immediately after a firmware update, use the manufacturer’s documented recovery method rather than downloading an unofficial BIOS file.

Windows updates and hardware drivers can also affect startup. Disconnect recently installed hardware and use Windows recovery options to uninstall the latest quality or feature update where available. Do not repeatedly interrupt the computer while it is updating, because incomplete system files can create a second problem.

Power interruptions are another consideration. Australian households can experience outages during storms, heatwaves, or local network faults, and a desktop without a UPS may suffer an abrupt shutdown. If a computer is deliberately kept running overnight, review [overnight power settings](https://marscripto.kz/blog/%D1%8D%D0%BA%D0%BE%D0%BD%D0%BE%D0%BC%D0%B8%D1%8F-%D0%BD%D0%B0-%D1%8D%D0%BB%D0%B5%D0%BA%D1%82%D1%80%D0%BE%D1%8D%D0%BD%D0%B5%D1%80%D0%B3%D0%B8%D0%B8-%D0%B7%D0%B0-%D1%81%D1%87%D0%B5%D1%82-%D0%BD%D0%BE%D1%87%D0%BD%D0%BE%D0%B3%D0%BE-%D1%82%D0%B0%D1%80%D0%B8%D1%84%D0%B0-%D0%BA%D0%B0%D0%BA-%D0% %D0%BD%D0%B0%D1%81%D1%82%D1%80%D0%BE%D0%B8%D1%82%D1%8C_%D0%BC%D0%B0%D0%B9%D0%BD%D0%B8%D0%BD%D0%B3) so scheduled workloads do not run through unstable shutdowns or poorly configured sleep states.

Protect files and personal information

Before handing a computer to a repairer, write down the symptoms and the last time Windows started normally. If possible, back up files to an external drive or approved cloud service. Do not share passwords unnecessarily. A technician may need a temporary account, but banking passwords, email credentials, saved browser sessions, and authentication codes should not be left exposed.

Australian businesses should treat customer and employee files carefully. Privacy obligations can apply under the Privacy Act 1988 and the Australian Privacy Principles, depending on the organisation and circumstances. A backup containing health, financial, or client information should be encrypted and stored securely. For household computers, the same approach reduces the impact of theft or accidental disclosure.

A good backup includes more than a single copy attached to the computer. Keep at least one separate copy and test that files can actually be opened. Windows File History, cloud backup, or an external drive can help, but each has different limits. A backup that has never been tested may not be usable when the internal drive fails.

Know when professional repair is safer

Professional help is appropriate when the drive is not detected, the computer contains irreplaceable files, BitLocker recovery information is unavailable, or recovery tools report partition errors. It is also sensible when the machine is a work computer, a point-of-sale system, or part of a home business where extended downtime is costly.

A reputable technician should explain whether the priority is data recovery, Windows repair, or hardware replacement. Ask for a diagnostic assessment before approving a format or reinstall. Under Australian Consumer Law, services supplied to consumers generally come with guarantees that they will be provided with due care and skill and be reasonably fit for the stated purpose. Keep the written quote and clarify warranty terms for replacement parts and transferred data.

Once the computer starts again, check Device Manager, Windows Update, storage health, and available free space. Remove unknown startup programs, scan for malware, and create a recovery drive. If the error resulted from a failing disk, replace it rather than relying on a temporary successful boot. A carefully configured backup and a tested recovery method make the next startup failure far less disruptive.