Milyen OP rendszerről van szó ??
Ha Linux, akkor ezt nézd meg :
https://serverfault.com/questions/321499/how-to-disable-all-power-manag…
https://askubuntu.com/questions/47311/how-do-i-disable-my-system-from-g…
On Ubuntu 16.04 LTS, I successfully used the following to disable suspend:
sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target
And this to re-enable it:
sudo systemctl unmask sleep.target suspend.target hibernate.target hybrid-sleep.target