Power Save Mode causing computer to need  logging again

When I start the monitor again after Power Save Mode and I press ctrl or another letter on my keyboard there is a new logging request made up of the name of the computer (Gigabyte), Jo Locked (My computer name) and I have to log in. There is nothing wrong with the monitor screen.

I tried the Dell instruction "

• "Hard" reset the monitor
  * Turn the monitor off
  * Disconnect the monitor power cable and all other cables from the rear/bottom/side of the monitor
  * If a mechanical monitor power button, press the button in for 30 seconds (clears any residual power in the circuits). If not a mechanical power button, just wait for 30 seconds
  * Reconnect all cabling and retest.

It was OK for one time and then went back to the problem.

I would like some help please.