Windows 10: Windows boot manager disappeared from UEFI Boot

So uh, my problem is that while I was watching YouTube suddenly I get the Blue screen of death and then it takes me to a black screen saying-Checking Media [FAIL]Checking Media…and then it just restarts looping over and over againSo I open my BIOS and immediately go to the UEFI Boot thing and open it to see-IPv4IPv6but no “windows boot manager”Extra info- it’s a dell 5520 and it’s some 10-11 years old

:)

 

UEFI boot options disappeared from BIOS; now getting reboot and select proper boot device

In short, I need to get the system/BIOS to allow UEFI booting of the SSD.

Computer started up today with default BIOS settings.

• Only SSD 1(Windows boot) and SSD 2 were listed in BIOS; HDD 1 and HDD 2 were not visible
• System would not boot. Gave the 'reboot and select proper boot device' message
• Boot menu has no UEFI/EFI (or Windows Boot Manager) entries anymore

I went into Partition Magic/Gparted and confirmed :

• All drives are still showing
• All drives' data is in tact [EFI volume/partition is still listed (and can be browsed/files accessible)]

Gparted print out (note dev/sda2 apparently that is normal behavior) :

/dev/sda1 (locked) EFI System Partition--Fat32--/media/sda1--100.00mb--46.81MiB--53.19MiB--boot,esp
/dev/sda2 (exclamation mark) Microsoft reserved partition--unknown file system--no mount point--128.00MiB--unused spaced--msftres
/dev/sda3 basic data partition--ntfs--/media/sda3--118.58GiB--70.78GiB--47.80GiB--msftdata
/dev/sda4--ntfs--/media/sda4--450.00MiB--327.71MiB--122.29MiB--hidden,diag



As I am able to boot Windows installation from USB, I tried the standard startup repair. It said it was not able to fix any problems.

Next I tried to repair the EFI with Diskpart in the shell:

• sel vol 1 (note that Diskpart states EFI partition is 'hidden')
• assign letter=z:
• cd /d z:\EFI\Microsoft\Boot\
• bootrec /fixboot
• bcdboot c:\Windows /l en-us /s vz /f ALL

It completed all tasks successfully. Unfortunately that did not work.

Other things I have tried :

• Removing CMOS battery and replacing with a new one - my HDD started showing up again after doing this.
• Using the old MBR commands(in hopes it would force the Windows startup repair to recognize and fix a problem)

bootrec /fixmbr
bootrec /fixboot
bootrec /scanos
bootrec /rebuildbcd​

• Loaded BIOS 'optimized'/defaults (the system did this already once before, hence why I am in this situation, though doing it manually seemed like an option worth trying. Note that after doing this and restarting the system, HDD's stopped showing again)
• Removed new CMOS battery and left it out of the system for thirty minutes
• Formatted EFI and msftres partitions, then rebuilt the EFI boot records

In summary, am looking to force the BIOS to see the EFI partition on the SSD boot drive, as it is not an option any longer.

 

Windows 8.1 boot isssue

While we are on the subject... I tried to use a antivirus emergency disk that I made with Sardu. It contains several AV programs on it. I have used this disk on XP, Vista, and Windows 7 with success. This mans laptop would not boot from it so I went into the BIOS and saw that Legacy is disabled by default and that UEFI is enabled. If I remember correctly under UEFI, Boot Manager was listed first then followed by the rom drive. I used the F keys to love the rom drive to the top taking the place of the boot mangers position. The computer still would not boot from the disk. I am new to BIOS with UEFI and wanted to know if I had done this correctly? If not, what would be the correct way to have it boot from emergency disks? Thank you!

 

No "Windows Boot Manager" entry of Boot Configuration of UEFI for Surface Pro 4

The only way I'm aware Windows Boot Manager will not set itself first to boot on a UEFI System is if it was installed in CSM or Legacy Mode. You can tell this in Disk Management by the presence of the legacy Active flag on System partition and lack of an
EFI System partition, or type msinfo in Start search to look in System Information at BIOS mode.

Sometimes the settings in the UEFI firmware are sparse and the only determinative for UEFI install is if the installation media is booted as a UEFI device and all partitions deleted down to Unallocated Space to reset if necessary the disk formatting from
MBR to GPT required for UEFI install.

The normal UEFI settings in BIOS are CSM, Legacy BIOS, UEFI, and under Boot Priority order. If you want to report back those settings choices we can help interpret them.

If the Windows Boot Manager was deleted from the list then you may need to Reset UEFI Firmware to Defaults using that choice wherever it appears - check all tabs.