Does anyone else own a Latitude E7470?

@BobFishell  The BIOS Setup has an option to reset all settings to factory default. Although after doing that, you might want to switch the system to UEFI boot mode. It may have shipped in Legacy mode for compatibility, but unless you need to use Legacy to run an old OS, UEFI would be a better choice.

I did that right off. It is in UEFI mode, but I'm getting a screen saying "no bootable devices found." I ran the diagnostics and they all passed. I also put the SSD in an enclosure and ran a chkdsk on it from another computer. No errors found, and the file system looks fine in Windows Explorer and Virtual Disk Manager. I don't have media to reinstall Windows 10. I need to look at the partitions on the drive again to see if the bios is trying to boot from the right one.

@jphughan this is good stuff, thanks.

A little more background - this is a computer I brought back from the dead after it was left out in the rain over the summer. I took the bottom off, removed the battery, and let it air out for a couple of weeks. I replaced the battery, plugged in the charger, and to my amazement, it powered up and got to the Dell splash screen. It wouldn't boot to the OS. I took the SSD out, cleaned the contacts, and reinstalled it. Still no boot. I ran the onboard diagnostics, and they found no hardware faults. I then put the drive into a USB enclosure and ran chkdsk on it from another computer, and it found no problems. The file system was intact, so no problems recovering the data. The issue is that this is a fairly nice machine, and I don't want to junk it.

I went into the BIOS setup to find that it was configured for legacy boot. This is a Win10 machine, so I expected it to be UEFI. I had to fiddle with the settings some more before I could configure it to boot into UEFI. Once I did that, I fired it up again, and it booted into Windows. All was well for about a month. Then my wife, whose computer this is, set it aside and let it sit until the battery got very, very dead. When she tried to boot it after charging the battery, it got past the Dell splash screen, then displayed a black screen with a message stating no bootable devices found.

Setup showed the drive as being present, and once again, onboard diagnostics found no problems. It just won't boot to the OS. Now, I suppose something might have happened to the boot sector during the time it was working after its miraculous resurrection. My wife does not treat her computers very well.

I did not record the settings I had when I got it working the last time, hence my inquiry here. A dead battery should not have affected the BIOS settings, but exposure to water shouldn't have changed them either, so I still suspect a problem in the BIOS. If that's the case, it won't boot from a flash drive, either. But it's something I can try.

I'll keep you posted.

@jphughan , I got the Win10 media creation tool from Microsoft as suggested, made a bootable flash drive, and the computer booted to it without incident. There is an option to repair your existing Windows installation and I ran that. It found disk errors. After a couple of tries with it, it said the system could not be repaired. This is in contrast to the onboard diagnostics, which found no drive errors.

I removed the drive and put it into an enclosure. When I plugged it into another computer, It found errors on the drive as well. I ran chkdsk on it and it found corruption in the Windows partition, but at least it made the drive readable so I could recover data from it. I haven't gone through the disk completely, but in my experience, when a SSD is corrupted, it turns into a tool for cleaning bird cages. I ordered a replacement SSD and when it arrives, I'll do a reinstall on that.

@BobFishell  The disk errors reported by Windows and those reported by onboard diagnostics would be different types of errors.  Windows would be checking for file system and data corruption errors.  Onboard diagnostics would be checking for hardware-level problems.  Still, diagnostics are notoriously unreliable when it comes to predicting or even accurately determining drive failure.  One such algorithm has the acronym SMART, which led to the adage that, "SMART is dumb."  But hopefully a replacement SSD gets you back up and running.  And if you aren't already planning to do this, consider making full disk image backups of your replacement once you get it set up. They make it a lot easier to recover from both hardware failures and even unexpected software-level incidents, such as OS patches that go sideways or otherwise bork your system, an outcome that has become worryingly more common over the last year or so of Windows updates....

It's my wife's computer or we wouldn't be having this discussion. But I'll make an image of it after I do a clean install so at least I won't have to start all over if it tanks again.

Thanks for the tips.