Not sleeping (general solutions didn't work)

Hello;

When I press Sleep at start menu, screen just goes to black for 1-2 seconds and after Windows Logon menu appears.

I've tried Allow waker timers to off, When sharing media to Allow the computer to sleep, Allow hybrid sleep to On/Off, USB selective suspend settings to Enabled/Disabled.

I unchecked "Allow this device to wake the computer box" settings in Device Manager for my network card and usb mouse. (I'm using desktop)

I also typed "Powercfg -devicequery wake_armed" at cmd to see which devices wake my computer up but it shows nothing. Just a blank line.

I checked event viewer to see what is the problem but I couldn't find anything in Windows Logs, Custom Views and Application and Services Logs.

On the other hand I can see Hibernate option at start menu when I set Hybrid Sleep to Off. This was a little bit confusing becasue it shows when it set to Off and disappears when set to On. Whatever, when it shows, than sleep is partially working but hibernate isn't. My computer goes sleep, but when I open it again I get blue screen error everytime says something like memory dump...

I really want to use Sleep option properly. If is there any idea, I'd like to give a shot.

Have you checked in the BIOS that sleep is enabled?

I checked the bios and the settings are fine. It set as sleep to memory.

Doesn't work, same thing happens as in the normal Windows sleep, wakes in 2 seconds...

Hallo Seregwethrin, I am picking by the steps you have already taken that you have already seen this
Power Options and Sleep Mode Problems - Vista Forums
But just in case you havnt ??

Change the sleep state to S3 and enable wake up by keyboard and mouse.

They've been set already to those values.

Having Sleep not show up on Power Options>Edit Plan Settings has always been a Display Driver issue for me.

Have you checked Windows Update for latest driver?

If so, try the latest Display Adapter drivers from both the computer and display adapter manufacturer's Support Downloads webpage for your model.

As you try different drivers, they will be stored in Device Manager>Display Adapter>Driver tab>Update driver>Browse>Let Me Choose where all stored drivers should be tried again.