Sleep Mode not working

[SmokenChicken]

Hello thee, I have a Acer spire X1200. I had just reistalled Vista on it and worked amazing tll a little bit ago. My sleep stop working. I can manualyput it in sleep but won't doit on its own.
-I have tried going into my device manager and on my netwok checking offnot allowing this device to wake, That didn't work.
- Ive tried changing the settings for the sleep itsself but nothig.
Any help would be amazing.
(Sorry if its the wrong section)

 

[hang-the-9]

Download and install the power management drivers for the computer, also make sure you have all the regular Windows updates for Vista.