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4 Posts


November 22nd, 2023 10:46

Windows boot manager failed


I've a problem that I've a server with 2 SAS drives and 2 sata drives.

I pulled out the SAS drives mistaken and started the server gave os failure.

Shutdown the server and put the SAS drives again and started but gave me the same problem.

Any solution about this?



2.1K Posts

November 22nd, 2023 15:00

Hello, sorry to hear that. Please restart your server and press F8 to enter the Windows Recovery Menu. From there, you can choose to repair your computer, use system restore, or run startup repair.

I encountered two articles below that might be useful. 

Cloned Drive BOOTMGR Missing Windows 10 (Solved) (

Windows Boot Manager on wrong drive [Fix] (

4 Posts

November 23rd, 2023 06:28

Unfortunately it's not able to enter windows recovery.



3.6K Posts

23-11-2023 07:12 AM

Hello, at this point I would say this is best addressed by MS Windows, actually.

Professionnel des médias sociaux et des communautés

4 Posts

November 23rd, 2023 07:21

My server is poweredge R740

4 Posts

November 23rd, 2023 07:31

@DELL-Young E​ 

Could you explain in detail what should I do.So my data remains undamaged.



2.1K Posts

23-11-2023 08:24 AM

Hi, you can check whether your RAID structure is damaged via iDRAC. Apart from this, you can check the boot sequence on the server side and try to change it if necessary. Dell PowerEdge R740 BIOS and UEFI Reference Guide | Dell US

Also, since the server uses UEFI BIOS, maybe you can try EFI repair here. However, unfortunately, there is no guarantee whether your data is damaged or not.  How to Repair the EFI Bootloader on a GPT Hard Drive for Windows Operating Systems on your Dell Computer | Dell US I can't think of any other methods other than this, but if there is something we missed, our community can help.


DELL-Erman O

Social Media and Communities Professional

Dell Technologies | Enterprise Support Services


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