virtualbox.org

I upgraded to VBox 5.0.16r105871 (VMs that I had still ok)
Installed Centos7 and VBoxGuestAdditions_5.0.17-105945.iso, all ok after reboot

Installed updates (kernel 3.10.0-327.10.1.el7.x86_64) reboot and all ok
Ran VBoxLinuxGuestadditions again to update VBox kernel modules

After reboot VM does not start, I only see a black screen.
3D acceleration is disabled for this VM, still no luck

Post the guests log file ( as an attachment ). Right click on the guest in the Main Manager then click show log. Save and post as an attachment. Compress if it is too large to post.

Log file attached as requested

Thank you. Now I have a few question.

1) Why are you using a test build of the guest additions?
2) I see the guest is a vmdk format, did you install it that way or was this a transplant guest from another PC, Etc?

You can remove the guest additions by dropping to a tty window when all you see is a black screen, then mount the guest additions iso and add uninstall to the end of the command.
This should bring back the guest if that is what really caused this issue.

- Unintstalled Guest additions, the VM was built on VMDK,
- Could login and use Centos7 VM, no mouse integration and seamless mode

- Guest additions downloaded from vbox site, I downloaded latest which is VBoxGuestAdditions_5.0.17-106108.iso
- I also did a fresh install, using VDI disk
Centos 7.0.1406, kernel 3.10.0-123.el7
- Installed latest Guest additions,mouse and keyboard integration works but seamless mode still not working
- I did not install the OS updates yet
- New VM log attached.

You should always update the guest OS at the very first. Bug fixes and regression fixes come out on a daily basis for new installed OSes. As for seamless mode it has always been an experimental feature and does not work properly for most users, so nothing I know can be done about that.

Thank you for all your help.

I was hoping on seamless mode for the Centos7 VM.