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windows 7 won't hibernate

I have windows 7 professional service pack1  HP Elitebook 8540w and my laptop won't hibernate. As soon as I click hibernate, I see if the laptop is going to hibernate mode but I see the login screen in few seconds instead. I have tried different things on different forums like disable network adapters and taking out any wireless mouse or keyboards etc but it won't make any difference. I have rebooted my system and when i typed  powercfg -lastwake, i get this, Wake History Count - 0. Also when I type
powercfg -devicequery wake_armed
I get no output. Any ideas
1 Solution
Hamid Reza MolahadiCommented:
Use this command: shutdown.exe /h
Look here -> LINK.
Really useful stuff to trace various problems.
mmalik15Author Commented:
i have jus tried shutdown.exe /h and it brings me back to the login screen
Hamid Reza MolahadiCommented:
Here's the thing:
Open cmd and then type: " powercfg -devicequery wake_armed "
a list of the configured devices to wake the computer will be received. Now if your list contains mouse or keyboard then it's ok but if it's contains NIC or something else you should disabled it, to disable items type: " Powercfg -devicedisablewake DEVICENAME "
DEVICENAME  is a device name listed as a result of running the first command.
For example, if the network card "Broadcom NetXtreme Gigabit Ethernet" is listed, we can type this command to disable it:
Powercfg -devicedisablewake "Broadcom NetXtreme Gigabit Ethernet"
After that, reboot the machine and then try again.
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