How can I investigate the cause of total hang? Is there some information that I should pay attention to in order to get some hint?

[孙世龙 sunshilong]

Hi，
Thanks to both of you.

>Does the Caps Lock light still go on and off when you hit the key?  If
>not then the machine has probably crashed completely.
>On reboot look in /var/log/syslog to see what it says.


>Try to switch into console mode with Alt+F3 or Alt+F4, login and check
>dmesg messages if there are any.

No response to any key(e.g. Caps Lock, Alt+F3, etc).
Any more methods that I should try.

Thank you for your attention to this matter.
Best Regards.

孙世龙 sunshilong <sunshilong369 at gmail.com> 于2020年7月2日周四 下午2:09写道：
>
> Hi,
>
> My x86 machine sometimes hangs, suddenly not responding in
> any way to the mouse or the keyboard.
>
> How can I investigate the cause of total hang? Is there some
> information that I should pay attention to in order to get some hint?