Can't wake from long sleep, only black screen

[HennoeR]

Hello,

I can set my computer to sleep just fine and can wake it up after a short period. However if the standby mode lasts more than a couple of hours I'm unable to wake it up by pressing a key on the keyboard or mouse (both connected via USB). Even though the system responds by spinnig up the fans (louder than usual, sounds more like the noise at boot up), the monitors turn on but only showing a black screen.

Any suggestions would be highly appreciated.

 

[ammulder]

You can make a long sleep work like a short sleep with this:

sudo pmset -a standby 0 && sudo pmset -a autopoweroff 0