VMs hangs if Virtualbox Manager isn't open

Discussions related to using VirtualBox on Windows hosts.
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jacks01
Posts: 2
Joined: 30. Jun 2022, 18:23

VMs hangs if Virtualbox Manager isn't open

Post by jacks01 »

Hi All,

Running vbox (latest) on a win10pro (latest), up until last wk, I was able to start any vm (linux or windows) straight from the vm shortcut without needing to open the vbox manager. However, when I do that now, none of the VMs will boot up, they hang during loading. As soon as I open the vbox manager, the VM will resume its boot.
Any ideas?

Thanks!
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boot hang screen for a linux vm
boot hang screen for a linux vm
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scottgus1
Site Moderator
Posts: 20965
Joined: 30. Dec 2009, 20:14
Primary OS: MS Windows 10
VBox Version: PUEL
Guest OSses: Windows, Linux

Re: VMs hangs if Virtualbox Manager isn't open

Post by scottgus1 »

jacks01 wrote:As soon as I open the vbox manager, the VM will resume its boot.
This is an interesting twist! Haven't heard of this before.
jacks01 wrote:up until last wk, I was able to start any vm (linux or windows) straight from the vm shortcut without needing to open the vbox manager.
Makes me wonder if a host update occurred.

Try setting the VM to 2 processors if it is not already.

If that doesn't work, right-click the guest in the main Virtualbox window's guest list, choose Show Log.

Search the far left tab's log for this text:

Attempting fall back to NEM

If you find it, Hyper-V is enabled. See HMR3Init: Attempting fall back to NEM (Hyper-V is active).

If you don't find that text, save the far left tab's log, zip the log file, and post the zip file, using the forum's Upload Attachment tab.
jacks01
Posts: 2
Joined: 30. Jun 2022, 18:23

Re: VMs hangs if Virtualbox Manager isn't open

Post by jacks01 »

scottgus1 wrote:
jacks01 wrote:As soon as I open the vbox manager, the VM will resume its boot.
This is an interesting twist! Haven't heard of this before.
jacks01 wrote:up until last wk, I was able to start any vm (linux or windows) straight from the vm shortcut without needing to open the vbox manager.
Makes me wonder if a host update occurred.

Try setting the VM to 2 processors if it is not already.

If that doesn't work, right-click the guest in the main Virtualbox window's guest list, choose Show Log.

Search the far left tab's log for this text:

Attempting fall back to NEM

If you find it, Hyper-V is enabled. See

If you don't find that text, save the far left tab's log, zip the log file, and post the zip file, using the forum's Upload Attachment tab.

Brilliant! Thank you so much!

Fixed with this command from your link.
bcdedit /set hypervisorlaunchtype off
scottgus1
Site Moderator
Posts: 20965
Joined: 30. Dec 2009, 20:14
Primary OS: MS Windows 10
VBox Version: PUEL
Guest OSses: Windows, Linux

Re: VMs hangs if Virtualbox Manager isn't open

Post by scottgus1 »

Great! Glad you're up and running.
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