I'm giving Windows 8 another shot, after giving up and reinstalling Windows 7 a few months ago. They've actually fixed a number of the irritations I had with 8.0, to the point that the positives are finally outweighing the negatives for me. There is one lingering problem, however, that I haven't been able to solve: The thing just won't go to sleep on its own. The screen will go blank according to that setting in Power Options, but it won't fully put the system to sleep. Things I've tried: Updated to latest BIOS version. Deactivated every wake_armed item with powercfg -devicedisablewake. wake_armed lists nothing now. Unplugged all USB devices, including the keyboard and mouse. Disabled and reenabled Hybrid Sleep to see if it made a difference (it didn't). Honestly not sure what else to try. With Windows 7, I was able to get it to auto-sleep without an issue. Any ideas on what else I might try? System is a homebuilt Intel i5-3570 desktop machine, with a Gigabyte H77M-D3H board and an AMD 6870 graphics card. Thanks!