Windows7 not normal "sleep" what to do?

Symptom: Since the upgrade from XP to Windows7 after the notebook can not normally use the "sleep" function, the use of sleep function, you can wake up, but the screen is black, nothing to see, reload the system is still so, this problem how to solve?

　　Workaround:

1, some motherboards need to open in the BIOS to support sleep function, can be in the "Device Manager" in the "system equipment", to see if there is a "acpi-compliant system" option, otherwise is not satisfied with the premise of sleep, need to open in the BIOS.

2, in addition, to ensure the correct installation or upgrade of all current hardware-compatible windows7 drivers, such as wireless network card driver, Bluetooth drive, etc. when not using the system, turn off mismatched and open hardware such as disconnected Bluetooth, disconnected wireless networks, and so on.

expand computer → manage → Device Manager. Then on the network card and other devices right click on "Properties", the "allow this device to wake up the computer" before the hook to remove, and then through the powercfg command line to view the status of power management ("start" → "program" → "Attachment" → "Command Prompt" → type "Powercfg-a").