"No Bootable Device" Error: Quick Fixes for Windows Users

Seeing "no bootable device" when you turn your Windows laptop on is alarming, and the screen gives you nothing to go on — the same message appears whether a setting has changed or the drive has died. At Esmond Service Centre in Singapore, we have spent over 16 years diagnosing and repairing laptop boot faults at our Alexandra and Sin Ming branches.

This guide works through the causes in the order a technician would, because the order is the part that matters: the one BIOS check that tells you which half of the problem you have, the fix for each cause, what each fix will and will not repair, and the point at which carrying on stops being free and starts costing you your files.

Incorrect BIOS Boot Order

If the drive is still listed in BIOS but the laptop will not start, the usual reason is that the firmware is being told to look somewhere else first — at a USB stick left in a port, at a network adapter, or at an entry for a disk that is no longer there.

How to Fix:

1. 1

   Restart the laptop and press the BIOS entry key as soon as the maker's logo appears — F2 on most Acer, Asus, Dell and Lenovo machines, F10 on HP, Del on many desktops.
2. 2

   Before you change anything, look for your drive. Open the Main, Information or Storage tab and check whether the SSD or hard disk is named there. This single answer decides the rest of this guide.
3. 3

   If the drive is listed, go to the Boot menu and move it — or Windows Boot Manager — to the top of the boot order.
4. 4

   Take out any USB stick, SD card or external drive that is still plugged in. A bootable one sitting ahead of your disk produces this exact message.
5. 5

   Press F10 to save and restart. If the drive was not listed at all, change nothing here and go to Has the drive actually failed?

Why this works: the boot order is a list, and the firmware stops at the first entry it can start from. What it will not fix: changing the boot order cannot repair damaged Windows boot files, and it cannot bring back a drive the BIOS cannot see — if your drive was missing from the list at step 2, nothing in this section applies to you.

Is the Drive Loose or Disconnected?

A drive that has worked loose in its slot disappears from BIOS in exactly the same way a dead one does. It is worth checking — but only on a machine where checking is actually possible, and only once you know what opening it costs.

How to Fix:

1. 1

   Check the warranty first. On most laptops sold in Singapore, taking the base off yourself ends the manufacturer's warranty. If the machine is still covered, stop here and let the warranty service centre open it.
2. 2

   Then check whether there is anything to reseat. Many current laptops — most thin-and-light models, and every MacBook — have the storage soldered to the mainboard. There is no connector to reseat and taking the base off achieves nothing.
3. 3

   If it is a serviceable machine, shut it down fully and unplug the charger. The internal battery stays live after the charger is out, so disconnect it at the mainboard before you touch anything else.
4. 4

   Find the storage — usually an M.2 stick held by a single screw, or a 2.5-inch drive on a caddy. Remove the screw, pull the stick out, then push it back in flat and firmly before replacing the screw.
5. 5

   Reassemble, power on, and go straight back into BIOS to see whether the drive now appears.

Why this works: being carried around and heat-cycled can walk an M.2 stick far enough out of its socket to break contact without ever looking loose. What it will not fix: reseating does nothing for a drive that has failed electrically, and nothing for corrupted Windows files on a drive BIOS can already see. If you are not sure which of those you have, that is the point to bring it in — our diagnostic is free, and it settles the question before anything is opened.

Corrupted Windows Boot Files

If BIOS lists the drive and the boot order is right, the disk is alive and Windows' own start-up files are the likely problem — a power cut during an update, a feature update that failed halfway, or a damaged partition table.

How to Fix:

1. 1

   Only do this if BIOS lists your drive. Repair tools write to the disk, and writing to a failing drive is how recoverable files stop being recoverable.
2. 2

   On a second computer, build a Windows installation USB with Microsoft's Media Creation Tool.
3. 3

   Start the laptop from that USB, then choose Repair your computer → Troubleshoot → Advanced options.
4. 4

   Run Startup Repair first and let it finish. If it reports that it could not repair your PC, stop there rather than moving on to boot commands you have found online.

Why this works: Startup Repair rebuilds the boot configuration and the small system partition Windows starts from, which is what a half-finished update usually breaks. What it will not fix: it cannot repair failing hardware, it will not help when BIOS cannot see the drive, and it does not recover deleted files. What it can cost: boot-repair commands typed in the wrong order can rewrite a partition table, which turns a fixable machine into a data-recovery job.

Has the Drive Actually Failed?

If the drive is missing from BIOS on more than one attempt — or it is listed, but the laptop has been freezing, taking minutes to open a folder, or making a noise it never used to make — treat it as a failing drive from here on.

How to Fix:

1. 1

   Power the laptop off and leave it off. If it is clicking, ticking or not spinning up, do not switch it on again — repeated attempts make a mechanical fault worse.
2. 2

   Decide which matters more, the files or the machine. If it is the files, that is a data-recovery job and it comes before any repair.
3. 3

   If you have a backup you have actually checked, and you only want the laptop working again, the drive is replaced and Windows reinstalled. At Esmond a laptop SSD replacement starts from $148 for 256GB, $178 for 512GB and $218 for 1TB, takes 3–5 hours, and carries a one-year warranty on parts and labour.
4. 4

   If you cannot tell whether the drive has failed, bring it in rather than testing it by restarting. The diagnostic is free and no-obligation, at Alexandra or Sin Ming.

Why this works: a drive that has dropped off the bus is a hardware fault, and hardware faults do not improve with retries. What it will not fix: replacing the drive gives you a working laptop, not your files — those are two separate jobs and they are done in that order. The honest cost of getting this wrong: the difference between a $65 Windows reinstallation and a data-recovery job is usually decided in the hour after the error first appears, by how many times the machine gets switched back on.

Legacy vs. UEFI Boot Mode Conflict

Windows can only start in the firmware mode it was installed under. This section applies when somebody has changed that setting, or when a BIOS reset or a mainboard battery replacement has put it back to a default — not as something to try when the earlier steps have not worked.

How to Fix:

1. 1

   Enter BIOS and find Boot Mode, Boot List Option or CSM. Write down what it says now, before you change it.
2. 2

   On any laptop of the last several years the answer is UEFI. Dell's own support article states that its computers from the 7th-generation processors onward "are designed to boot exclusively in the UEFI boot environment. As a result, the operating system fails to boot if Legacy boot mode is selected on these computers."
3. 3

   If the setting reads Legacy or CSM, put it back to UEFI, save and restart. If it already reads UEFI, leave it alone.
4. 4

   Do not try Legacy "to see what happens". Microsoft states that after Windows is installed "the device boots automatically using the same mode it was installed with", and that changing mode afterwards needs the MBR2GPT conversion tool — not a firmware toggle.

Why this works: UEFI and Legacy look for a start-up file in different places on the disk, so the wrong mode produces this error on a perfectly healthy drive. What it will not fix: anything else — and if the mode was already right, changing it creates the fault instead of curing it. What it can cost: Dell states that where the operating system was installed in Legacy mode, the machine "cannot be recovered by changing the Boot sequence back to UEFI mode. Operating system reinstallation should be performed." That is a one-setting change that ends in a wiped disk, which is exactly why you write the current setting down first.

Preventing "No Bootable Device" Errors – Essential Tips & Best Practices

Most of what turns this error from an afternoon's inconvenience into a real loss is decided long before it appears. Four habits do nearly all of the work:

• Keep a backup that runs on its own. A copy you have to remember to make is a copy you will not have.
• Save your BitLocker recovery key somewhere that is not the laptop — printed, or in your Microsoft account — while the machine still starts.
• Shut Windows down properly instead of holding the power button. An interrupted write to the boot files is one of the commonest causes of this error.
• Take the warning signs seriously. A drive that has started freezing, taking minutes to open a folder, or making a new noise is telling you it is going, and that is the cheap moment to act.

At Esmond Service Centre in Singapore, the boot faults we see fall into two piles: settings, which cost an hour, and drives, which cost whatever was on them. The four habits above decide which pile you land in.

Struggling with a "No Bootable Device" Error? Contact Esmond Service Centre Today!

If the drive has disappeared from BIOS, or you would simply rather not open the laptop yourself, bring it to Esmond Service Centre at Alexandra or Sin Ming. The diagnostic is free and no-obligation: we identify whether the cause is BIOS settings, a loose or failed drive, or corrupted boot files, and quote before anything is done. Windows OS repair starts at $65 for a reinstallation with all drivers, in 3–4 hours; a replacement SSD starts from $148 fitted; and if the files matter more than the machine, data recovery is evaluated free, quoted at a fixed price, and charged on a no-data-no-fee basis. Prices are before GST.

Reviewed and published by Esmond Liu, Founder & Lead Technician Trainer at Esmond Service Centre, on June 9, 2025