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Re: PC won't wake up after Hibernate, Standby or Restart
You need to take off your hibernation.
In control panel display then screensaver.Then click power at the bottom of that screen.
You'll see a setting for system standby you can set that to never.At the top click on hibernate remove the check in enable hibernation.
Click apply restart and your system should work.
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Most likely you are touching the keypad or mouse and it thinks you are waking it up. You might try selecting hibernate instead of standby which will put it to sleep and won't wake up until you press the power button. If you don't have the hibernate choice you'll need to go into your power settings to enable hibernation.
Turn Hibernate off for one thing. Hibernation leads to registry problems and boot issues. Go to control panel > power options > hibernate tab > uncheck the box. Reboot the machine. If you want, the laptop will go into standby mode after a period of time and will wake up with a touch on the touchpad. Go back to power options and there are settings in there that you can tailor to your liking.
I'm not a big fan of using hibernate or standby, I've seen it cause too many problems, such as the one you're having. I shut my machine down when I'm done, or let it run if I'm coming back within a reasonable amount of time. I've also seen hibernation or standby create operating system errors or glitches, and premature hard drive failure. If the machine is working properly other than hibernation/standby you should shut the hibernation off and just shut the machine down when not in use. If you're getting this error when using the power button to turn off the computer, then the operating system has glitched or is corrupt and needs to be reistalled. If you need anymore help with this let me know.
I had the same problem on my Toshiba Satellite U305, struggling with it for the past 4 months and having to use Shutdown each time I was done using it. Very frustrating! Toshiba worked with me several weeks, telling me to re-install Vista and all the fixes, which took a lot of work backing up etc and this did not fix the problem. Today they finaly told me to try entering this special command and it fixed my problem. Maybe it will fix yours too.
Create a shortcut on the desktop and to make the shortcut, right click on the desktop, choose Create Shortcut, enter CMD.EXE where it asks you to "Enter the location of the item". This will create an icon on the desktop that looks like a mini-command prompt. Then on the desktop, RIGHT click on the CMD.EXE shortcut/icon you have created and select "Run as administrator". This will open a command prompt window. Here in the black-box with white letter window, enter the command "powercfg -h on" (without the quotes). Reboot and see if the problem is resolved. This fixed my Toshiba Satellite that had this problem.
Sony laptops are infamous for these kinds of problems. You very likely have another Sony program running in the system tray which is trying to control all power functions in a "smart" (in other words, defective) manner, and this is conflicting with and resetting your OS's normal power settings. Try to find this program on your laptop and run it and check what it thinks it is doing. You might also have a problem with the actually writing of the hibernation file on your machine due to any number of problems (low disk space, conflicting file names, corrupted administraive priveledges for whatever program thinks it is doing the writing). I'd suggest uninstalling the SONY power management software and then using the stuff the operating system provides. It might not be good, but it at least works kind of, and consistently.
The changing status of the hibernate settings you describe suggest to me that another program is changing them to try to be "efficient".
Last resort - disable hibernate; it doesn't work very well on Sony laptops even at the best of times.