USB keyboard and mouse suddenly not recognized  

If all else fails, try a Repair Install of Windows 10

If all else fails, do a Clean Install

spunk
If all else fails, try a Repair Install of Windows 10
He cannot boot into windows
You will only be able to do a repair install of Windows 10 from within Windows 10.

devnull

I know you have checked that windows boot manager is the boot device
please go back to UEFI setup and check that the drive is shown in the setup, NOT the boot part of the setup, but the item that shows the drives recognised by the firmware also check please what mode is shown for the drive
eg. AHCI.

Providing everything seems Ok there
could you go back please to cmd prompt
type
bcdedit
and as you will be in recovery mode, could you record the bcdedit as a camera shot and then attach it please.
OR if you know what you are looking at check it is OK
Basically you will have a windows boot manager and then a windows boot loader as on this link
https://docs.microsoft.com/en-us/win...tings-for-uefi
the other mentioned diskpart etc are not applicable at this stage.
You are only using that example on the link to check the bcdedit.
Here is another example
=======================================
Your data should be OK, when you try the next step, but what please do you need to keep from the Inspiron, just in case, something goes wrong.

There are a few ways to do this - to copy your data
Do you have an external hard drive you can connect to the Inspiron

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spunk
I do not wish to be confrontational - that is not my style
but to post a repair install when it is obvious the system cannot be booted into windows and then when that is pointed out to you - to post

If all else fails, do a Clean Install

is NOT a great deal of help.
===========================
nevertheless - thank you for posting.


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devnull
We are not even close to a clean install - please do NOT consider it at this stage.

cheers
I suspect we will have to rebuild the bcd
Before we proceed

what please do you need to keep from the Inspiron, just in case, something goes wrong.

I do expect anything to go wrong, but it is a wise precaution to back up at least your personal data just in case

OK
follow this procedure please
https://www.dell.com/support/kbdoc/e...ur-dell-pc#GPT

UEFI
so in the recovery cmd prompt
type
diskpart
then
type
list disk
you should on that inspiron only have the one internal drive listed - I think

The output will show you that the disk with windows is GPT by way of an asterisk

When you have identified the disk select it
select disk 0
in diskpart disks are numbered at that stage - not lettered
it will respond
disk 0 is now the selected disk
now type
list volume
you should see the EFI partition which should be FAT
you should also see the windows partition - which of course will be NTFS
and a reserved partition and probably a recovery partition.

Then go from the guide on the link above by lettering the FAT partition, as that is the one that in the boot order is named
windows boot manager and is the partition form which windows first boots - as you can see on my screenshot on post 14.

You need to letter it, so that you can then write the new bcd

Here is another guide for you to also look at although it is the same as the one from Dell
How to Repair EFI/GPT Bootloader on Windows 10? | Windows OS Hub).

which also shows the first part of my typed cmds.


++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Cheers
One point I forgot to explain if necessary is that the cmd on the dell link
bcdboot c:\Windows /l en-us /s <boot letter>: All

does not make it clear which is boot letter
it is explained on the other link
bcdboot C:\Windows /l en-us /s k: /f ALL

where k: is the letter that was allocated to the FAT partition


I will wait to hear from you
Even if it does NOT work, we still have options left before you have to resort to a reset/refresh
OR at worst a clean install

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devnull
signing off now for this session
0114 Uk time
back approx 1800 Uk time