We had a visitor to our youtube channel send us a message that they installed a hard drive alongside the drive that is already in the machine and now it will not boot up. Instead it gives the error “BOOTMGR missing”.
This is a pretty common error and is relatively simple to fix but it can be pretty confusing the first time you see it. In your computer’s bios it keeps a boot device order. Most of you will know the boot order from needing to set it to boot from cd to use your diagnostic cd or load a new Operating System. However some computers also keep another order that is called “hard drive boot priority” and it decides which storage device boots first when you are booting from a hard drive.
If you hooked up a hard drive to “device 2″ on your motherboard when you first installed it and come along and plug in a drive to a higher port (0 or 1) the bios with automatically default to booting from the newly installed drive. Since this drive is meant for data storage and has no OS on it you get a BOOTMGR or boot manager missing error. Going into the bios and setting your hard drive priority to the correct drive should correct this issue. If you have multiple drives that are the same model (they will show up as the same thing) then just try them in a few different configurations until you find one that works.