Windows 10: Dual Boot Only Boots Into Default OS- "Choose Operating System" broken

I have a dual boot system, and at the blue selection screen "Choose Operating System", it offers the choice between two builds of Win10.

Before an update 'broke' it, I would just click on which OS I wanted, and it would boot into that OS. Now, it only allows me to boot into the *default* OS, even though it still offers me two choices at startup.

If I click on the non-default OS, the computer reboots and then hangs at the splash screen.

I can still access the other OS, but to do so, I have to power off, reboot, and change the default OS in the options to make it work.

I want to restore the ability to choose which OS I boot into by simply clicking on it. Thanks in advance for your help.

Note: I don't know if this is important, but this laptop has a 250GB PCI Express 3 M.2 Solid State drive, split into 2 partitions, which contain each OS.

:)

 

How to make make a particular OS as default boot.

Hi Mohammad,

As per the description, I understand that you had installed two Windows 10 Operating systems on a particular hard drive, where one is genuine.

If you would like to make the genuine Operating system as the default boot, please follow the below steps.

• 
  Press the Windows + R keys to open the Run dialog, type
  msconfig, and press Enter.
  
• 
  Click/tap on the Boot tab.
  Select the operating system you want to delete that is not set as the
  Default OS, and click/tap on Delete.
  
  NOTE:
  If the OS you want to delete from the list is the
  Default OS, then you will need to change the default operating system
  to another listed OS first.
  
• 
  Check the Make all boot settings permanent box, and click on
  OK.
  
• 
  Click/tap on Yes to confirm.
  
• 
  Click/tap on the Restart button.
  

Hope the steps provided helps you to select the default Operating system on boot. Please do let us know if you need further assistance. We will be glad to assist you.

Thank you.

 

Choose Default Operating System to Run at Startup in Windows 10

Would this also apply if a Linux OS was installed after Windows 10, or, does this apply only to Windows OSs dual boot?

 

' choose an operation system to start"

thank for your assistance,

i did the above step and it shown me only win10 as a default os and there isnt any other operation system except win 10 pro, My computer was booting normally for weeks ago but newly it starts to ask me to choose an operation system, is there any app can
effect on my PC boot because i download many new app.