Hello Phil,

The latest update on the "Downloads" page<1> contains a number of fixes, 
possibly including for what you are seeing.

Regards,

Michael

<1> https://www.virtualbox.org/wiki/Downloads

On 09.03.2016 17:19, Phil Schaffner wrote:
> Could not exactly replicate the problem upgrading a different CentOS 7.2
> guest from 5.0.16 guest additions to 5.0.217. Instead of hanging at a
> blank screen the guest boots up in reduced resolution and there is no
> mouse pointer visible. Mouse does work "blind" but is difficult to
> control. Will send the logs separately directly to you. Please let me
> know if you need anything else.
>
> Phil Schaffner
>
> Michael Thayer wrote on 03/09/2016 04:38 AM:
>> Hello Phil,
>>
>> On 08.03.2016 20:11, Phil Schaffner wrote:
>>> After installing 5.0.17 r105881 Guest Additions update for Linux guests
>>> on a CentOS 7.2 guest the VM never finishes booting into the GUI. Just
>>> get a black screen with a cursor. It can boot successfully to text mode,
>>> runlevel 1 or 3. Attempting "telinit 5" ends up with a black screen.
>>> Tried re-installing 5.0.17 to no avail - still black screen.
>>>
>>> Downgrading to 5.0.16 in single user mode and rebooting allows the VM to
>>> work again.
>> If you are interested in helping debug this, could you please provide a
>> log from the virtual machine, and a guest system log (you can probably
>> get this with journalctl somehow) and X.Org log, as well as the file
>> /var/log/vboxadd-install.log?
>>
>> Thanks.
>>
>> Regards,
>>
>> Michael
>
>
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