Vista hibernates intermitantly

A few months ago I did a clean Vista Business install on a new hard drive on one of my office computers. I leave the computer on all the time.  Occationally, after being on overnight, we will find the computer in hibernation when we arrive in the morning.  I have checked to confirm that Vista is not set to go into hibernation at all.  I have checked the bios to confirm that it is not set to send the computer into any type of hibernation.  It happens intermitantly. To get it out of hibernation, I must hold the on/off button for a few seconds to get the machine to re-boot. After re-boot it takes a long time for the hibernation message to show then another long time for the passwork box to show. Of course, Microsoft telephone technical support was unable to help. This machine is connected to a usb scanner, a usb printer and a usb fax-modem. It is on a small peer-to-peer network.  It does not share any of its drives to any other computer on the network but does have access to other drives on the network. How do I prevent Vista from going into hibernation on its own?  
kentcraneAsked:
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LeeTutorConnect With a Mentor retiredCommented:
All right, here's another page with a bit more information:

http://www.petri.co.il/quickly_enable_or_disable_vista_hibernation.htm

The Control Panel option is what you would use if you have not turned off the hybrid sleep function.  If you go to Power Options in Control Panel and click on the link toward the left labeled "Change when the computer sleeps", you can turn if off by selecting Never, or otherwise you can choose from various time periods between 1 minute and 5 hours.  The Microsoft article says you may lose data if you still have the hybrid sleep function enabled while hibernation is disabled if you suffer a power loss.

In Control Panel, and also with the PowerCfg command there are many different things you can control regarding how you wake out of hibernation, etc.  The petri.co.il page also mentions some problems regarding hibernation and sleep you may encounter after doing a disk cleanup operation, which may be what happened to you...

In the Vista help section, there is this quotation:

What happened to standby and hibernate?

In earlier versions of Windows, standby saves your work to memory and puts your mobile PC into a power-saving state. Hibernate also puts your mobile PC into a power-saving state but saves your work to your hard disk so that you can safely turn off your mobile PC.

In this version of Windows, sleep saves your work to memory and puts your mobile PC into a power-saving state. Optionally, you can turn on hybrid sleep, a combination of sleep and hibernate, which saves your work to your hard disk and puts your mobile PC into a power-saving state. Hybrid sleep is turned off by default on mobile PCs.



The PowerCfg command can be used to control all sorts of options regarding hibernation and standby and sleep.  There is a complete syntax description on this page:

http://technet2.microsoft.com/WindowsVista/en/library/1d58b934-f56a-4796-b2df-7be2eb9c03bc1033.mspx?mfr=true
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LeeTutorretiredCommented:
See this MS article:

http://support.microsoft.com/default.aspx?scid=kb;en-us;920730
How to disable and re-enable hibernation on a computer that is running Windows Vista
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kentcraneAuthor Commented:
I am sorry but the Microsoft instructions seem a little confusing:

"Hibernation is made unavailable when you set the value of the Hibernate after setting to Never by using the Power Options item in Control Panel. To make hibernation unavailable, follow these steps:
1. Click Start, and then type cmd in the Start Search box.
2. In the search results list, right-click Command Prompt, and then click Run as Administrator.
3. When you are prompted by User Account Control, click Continue.
4. At the command prompt, type powercfg.exe /hibernate off, and then press ENTER.  
5. Type exit, and then press ENTER.  "

My question is, Which is it? Do I make hibernation unavalable by using the setting in the Control Panel or by going through the steps in the cmd box? Earlier in the article I am warned that if I do it wrong that I may lose data.  I am not sure that I want to make hibernation unavalable, I just want to be able to tell my software when to do it and when not to do it. Is that an unreasonable request?
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kentcraneAuthor Commented:
Further, the MS article does not answer the question of why I cannot wake the computer after it has gone into voluntary hibernation. As I originally said, I must re-boot the computer to get it to wake up.
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LeeTutorretiredCommented:
kentcrane, any feedback?
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kentcraneAuthor Commented:
Because the problem is intermittant, I cannot immediately tell whether the solution offered is correct or not but have accepted the answer to close out the question.
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