no signal at the monitor..

I usually log out from my account, let the pc working and close the monitor. When after some hours I try to open again the monitor I get the msg “No Signal” I move the mouse I press some buttons at the keyboard but nothing… I have to reboot again to see the monitor working… What can I do? Please help…

Why logout?
Just Lock the screen instead.

because another user is using the computer with another account!

Can’t you use ‘switch user’
It runs another user in parallel

yes but isnt loaded so the computer?

Sorry but I don’t understand this comment:)

I mean that switching user , the settings of the previous user is holded in the ram of the computer, so the computer is more “loaded”…

I don’t do this myself any more, but I did a ways back in 10.0
I only had 512MB RAM then and it was no problem