Why doesn't Windows 7 wake up from sleep?

I upgraded my Vista Ultimate to Windows 7 Ultimate (RTM) and after that it doesn't wake up from sleep. When I power it on it turns on but nothing happens, but if I press the reset button it boots and then wakes up, I mean, it doesn't reboot Win 7, it actually wakes up.

Anyone have any clue about such a weird behaviour?

It always worked fine on Vista. I have a GForce 8600 with the latest drivers.

Answer

Ideas for resolving not coming out of sleep:

1. Disconnect any and all unnecessary devices from your PC. Pare it down to the absolute minimum : unplug anything you can disconnect, turn off and unplug the computer from the mains for a few minutes, then reboot.


2. Look in your BIOS for the suspend ACPI options and try to switch modes among "S1 and S3", "S3" etc.


3. Ensure "Allow this device to wake computer" is checked in in "Device Manager/$device$/ Properties/Power Management", where $device$ stands for keyboard and mouse.


4. Turn off Hybrid sleep, see explanation here (for Vista, but is the same)


5. The hibernation file is sometimes disabled by disk cleaning, to restore do in cmd run as administrator "powercfg -h on".

You can use the following command to troubleshoot sleep problems and return a detailed report:

powercfg -ENERGY