AN515-55 Default boot device missing or boot failed

I have Acer Nitro 5 laptop

And since long time I am encountering this default boot device missing or boot failed issue on startup

I have tried all ways through YouTube and acer discussions but nothing is helpful my laptop shows this everytime I on it but after many attempts like 20-30 bios settings changes like enabling disabling couple of things couple of time the laptop starts sometimes but after I shut it down after work this happens again when I open it again and it's been many months this is happening please sometime help me it would be real help.

Also I have tried lots of bios settings, I don't have legacy option, i have changed sata many time and I don't see hdd anytime in the UEFI mode, tried disabling the UEFI also by changing passwords, also. Tried F10 before acer logo and reset of the PC as well but nothing is working. I have tried opening laptop and checking the hdd proper connection and battery unplug and replug.

Here are pictures of what my bios look like but this is default I have played with these n number of times

Please someone help me.

[Edited the content to hide sensitive information and to add model name to the title]

Accepted answers

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JackE

The SATA optane mode without RAID detected in the BIOS Information page doesn't seem to match the SATA optane mode with RAID setting in the BIOS Main page. I suspect that you may have a malfunctioning optane accelerator chip for the Seagate hard drive.

If you can still sometimes boot into Windows, press WIN+R. Then enter 'diskmgmt.msc'. Post a screenshot of the result if possible.

Gaurav0412

Hey Jacke thanks for answering please buddy help me get rid of this issue this is what it showsh after diskmsmg.

JackE

OK. You seem to have a 256GB or 512GB SSD Windows boot C : \ drive and a 1TB HDD data D : \ drive.

Now press WIN+R again. Enter 'msinfo32'. Expand the components folder in the left pane. Expand the storage sub-folder under components. Click on "Disks" sub-folder.

What are the disk model numbers listed for the two disk drives? One should be the Seagate HDD model st1000lh049-2gh172. A screenshot would be nice.

Gaurav0412

It shows this after that

Gaurav0412

And this is second part of that

JackE

OK. Press WIN+R again. Enter "msconfig". Click on the BOOT tab. In the boot option section, checkmark Safe Boot. Click OK. Then re-start Windows. Report back for further instructions after confirming that Windows seems to boot into Safe Mode OK.

Commodore_1995#

https://community.acer.com/en/discussion/comment/1218382#Comment_1218382

Yes! Furthermore, the SSD also no longer appears in the main BIOS tab. I would try resetting the BIOS settings first by resetting the lithium battery.

Gaurav0412

Hey Jacke I haveboot into safe mode what next?

Gaurav0412

Also if there more steps kindly mention those all as It seem we have time difference and it's so hard to follow things if you say to do something and then I revert after few hours hope you get it.

Gaurav0412

Egydio how to reset lithium

Gaurav0412

Jacke after safe mode boot I am not getting wifi option or internet options how do I connect to wifi

Gaurav0412

What option should I select below safe boot

JackE

OK. While it's in Safe Mode, re-start the machine. IMMEDIATELY start tapping the F2 key to re-enter the BIOS menu. Then click the MAIN tab and change the SATA mode to AHCI mode. Then press F10 to save settings and exit BIOS menu.

The AHCI mode drivers should be loaded in Safe Mode. After Safe Mode boots again, press WIN+R again. Enter 'msconfig'. Click on BOOT tab. UNcheck Safe Boot. Re-start Windows.

Normal Windows should now load in AHCI mode.

Report back confirming that it boots Windows normally because I have a few comments on the Western Digital 256GB SSD C : \ boot drive and its BIOS detection.

Gaurav0412

Yes I have followed all the steps and it has now boot back

I am not sure if normal window have loaded with AHCI but I follow your instructions and it has booted with normal window now

JackE

And since long time I am encountering this default boot device missing or boot failed issue on startup
it has booted with normal window now

OK. Do NOT try to change any BIOS settings if this happens again.

Instead, press and hold the power button till the machine turns off. Wait a few minutes. Then turn the machine on and IMMEDIATELY start tapping the F2 key to re-enter the BIOS menu. Press F10 to save settings and exit even if the Western Digital boot drive doesn't appear and even though you haven't made any changes.

This method often fixes an SSD that is not being detected by or showing in the BIOS Information page after a power off period of time. It may not be a serious issue with the SSD but only an occasional annoyance that seems to afflict some SSDs.

Good luck.

Gaurav0412

Thanks jacke i hope that fixes it if it happens again ill report that to you.

You have been great help.

JackE

OK. I'll keep my fingers crossed for you. 🙂

Gaurav0412

Jacke it's still not fixing it is there any permanent solution for this I am really tired of doing that over and over again and again, please help me.