Windows 7 Pro x64 suffering from insomnia

My Win 7 Pro x64 is unable to enter sleep mode.

Pressing the sleep button results in strange state where the computer starts entering the sleep mode, the display is turned off but then the whole process stops, it does not switch off the hdd, the keyboard still responds to numlock/capslock, but the display does not on anymore. I have to cut power and restart. If I remove everything (wireless mouse, external hdd, usb hub, etc.) it does enter sleep mode, but if there is something left, it does not, though every one of them has "Allow the computer to turn off this device..." checked and "Allow this device to wake the computer" unchecked.

Why does it not work? It was working properly in the RC.

Solution 1:

I had to resort to using a program called Sleep.exe to get sleep to work on my Windows 7 x64. Make sure to use it with the /f switch.