Bootmangr is missing error, only if i try and get in to the bios.

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  1.    16 Apr 2016 #1

    Bootmangr is missing error, only if i try and get in to the bios.

    This is driving me nuts.
    Im trying to get in to the bios (F2 or Del) so i can change the password. When hitting any key on the keyboard i get an error that Bootmangr is missing, and to re start my PC. If i dont try and get in to the bios Windows starts fine.
    This is not random, its happening every time. I do have a password on the PC, and can enter that fine, but its just a user password which i need to change.

    Iv never seen this happen in all my PC years, and while its not the end of the world i know its something that isnt right and will cause me issues later on.
    The fact that Windows starts fine if i leave it to its own devices is the confusing part, as it means Bootmangr isnt missing or corrupt.
    My thoughts are that by pressing a key down i might be causing the HDD to delay starting, and so giving me this error. Just a guess though.

    Formatting and re installing answers are going to be helpful, as im not going to do this. Its always easier said than done. I need to figure out what the issue actual is, in case it happens again.

    System is running Windows 10 64 bit, and its been working fine since Win 10 came out.
    Ive done a start up recovery and no errors have been found.

    Cheers for any help.

      My ComputerSystem Spec

  2.    16 Apr 2016 #2

    Hi fliplip and welcome to Tenforums.
    It may help people to help you, if you fill in your system specs, so we know what kind of BIOS we're dealing with.
    Thanks! :)
      My ComputerSystem Spec

  3.    16 Apr 2016 #3

    Thanks for the welcome. I'm about 200 miles away from my PC so that's why the profile is as it is. All I can remember is its a 3 year old Asus MoBo. Can't fill the info in until Monday.
      My ComputerSystem Spec

  4. Berton's Avatar
    Posts : 5,668
    Win10 Home and Pro, Win10 Insider Preview, WinXP Home Premium, Linux Mint
       16 Apr 2016 #4

    Is it BIOS passwords you want to change [there's 2 possibles] or the Windows login password? The BIOS can be set to first keep the computer booting to the OS/Operating System and the second is to prevent any changes to the BIOS settings including the other password. The BIOS passwords are not in much consumer use but are somewhat favored in businesses where more people would have access.
      My ComputerSystem Spec

  5.    16 Apr 2016 #5


    I have two bios passwords set, one is a user setting that locks the PC, the other is the bios admin password. My son found out the user password so I just want to change that. Ive used this method for years and it's only just stopped working over the past week.
    The issue is I can't get in to the Bios, due to Windows failing if I hit a key on the keyboard to access the bios.
    I have no trouble entering the user password, as that's the first screen that comes up when the computer is turned on.

    I'm wondering if I should just do a system restore first to make sure it's not Windows causing any issues.

    I hope that makes sense.

    Im not a novice, I've been building all my own PC's for about 20 years, but do admit I'm not an expert either.

    Last edited by fliplip; 16 Apr 2016 at 13:38.
      My ComputerSystem Spec

  6. Berton's Avatar
    Posts : 5,668
    Win10 Home and Pro, Win10 Insider Preview, WinXP Home Premium, Linux Mint
       16 Apr 2016 #6

    Most of my computers don't use UEFI so they boot to the BIOS process which all occurs before the OS loads. If I can't get into those BIOS' I can't boot the computer.
      My ComputerSystem Spec

  7. essenbe's Avatar
    Posts : 11,596
    Windows 10 Pro and Windows 10 Pro Insider
       16 Apr 2016 #7

    fliplip, I want to make sure I understand. You can enter the user password to enter the OS with no problem. But you cannot enter BIOS? Is that correct? I know you said you have been building computers for quite awhile, but are you sure you are entering the BIOS boot key at the proper time? I ask because, it is my understanding that at startup the BIOS goes through the initialization then turns the boot process over to the hard drive. You enter BIOS before the process turns it over to the hard drive. So, the problem, as I understand it, cannot be the OS because the BIOS entry is made before the OS becomes involved. Therefore I would suspect a problem other than the OS.

    What type of keyboard do you have? Could it be the issue? Here is a solution you may try, assuming you have a UEFI Bios. I don't believe it will work with a legacy bios, but it may be worth a try.
      My ComputersSystem Spec

  8.    16 Apr 2016 #8

    Thanks again for the replies.

    First off, thus has been working perfectly on this PC for about 3 years, with Windows 7, 8 and now 10, and I've had other PC's that I do this with. I know when and how to hit the relevant keys, and have no issues with entering the bios password to allow the PC to hand over to the OS so it boots ok. Letting it do this works fine 100% of the time.
    Once the password has been entered I see a screen that shows the MoBo name and at the bottom is a line of text that says hit F2 one Del to enter Bios. Normally doing this, at this time will evoke a new password box, and once the correct password is entered I get in to the Bios set up screens.
    At the moment if I hit either of those keys on the keyboard (I've also tried another keyboard), I get the Bootmangr file missing error, and i have to reboot. This makes no difference, same options/error depending on what I do.

    Unfruatlualy I don't have a UEFI bios boot option under Advanced start up settings.

    I too can't see how it's a OS issue, BUT it's Windows that is complaining it can't find the boot file. As I know the Bios hasn't changed I can only assume something in the OS is causing this.

    Possible that the C: drive is stalling when I press a key maybe?
      My ComputerSystem Spec

  9. essenbe's Avatar
    Posts : 11,596
    Windows 10 Pro and Windows 10 Pro Insider
       16 Apr 2016 #9

    I was not trying to make it sound quite like it did when I made that suggestion. I was simply trying to "logic" it out. I don't recall ever hearing of a problem like this before. I thought I had encountered every possible problem that could happen, but obviously not.

    I have had both Legacy and UEFI installs on this computer at different times. It does not matter which, the process for entering the BIOS is the same, although I don't use passwords.
      My ComputersSystem Spec

  10.    16 Apr 2016 #10

    No offence taken, I too have never seen this happen before. Normally I can figure these things out, but not this as I've not seen it happen before. I'm just not sure where to look. I could re set the bios by taking the battery out and shorting it out, but as this is post bios I'm not sure that would help.
    ill post back if I do figure it out, but I can't do anything until Monday when I'm back home.
      My ComputerSystem Spec

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