Windows do not go to standby mode after being left idle

Windows 7 Home Premium, Dell Inspiron 1545 laptop

My laptop won't sleep after be left idle.

I checked all power options, including allowing the laptop to sleep when sharing multimedia. I checked the Device Manager for hardware that can wake up my laptop. There are no programs that are listed etc..

When sections of battery, in that the critical level, my laptop will put into hibernation.

I am currently using power options that don't work by default energy savings.

I'm pretty sure that my laptop used to go to sleep with Windows 7 installed, but have no idea what has been changed and don't like formatting etc.

It makes me crazy... I'm not a novice in computer and googled, I tried many different options etc.!

Thanks for any help.

I managed to fix this now.

My audio driver (IDT High Definition Audio CODEC) observed an open audio stream, preventing sleep. Downloaded and installed the latest driver well.

I discovered this by using "powercfg-applications" command at the command prompt.

Tags: Windows

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