I installed lubuntu operating system

Everything works
The only trouble is
If the computer is turned off for a long time and turn it
Computer turns on but the system does not load


What happens is that the screen turns off
And the computer continues to work

Could very well be that the system rises
But I have no way of knowing because the screen is off

Need to press and hold the shutdown button
To turn off the computer
Then turn on again
Just then the system is loading correctly