DELL Optiplex 790 turns itself off on Weekends or after long inactivity

Hi,
 
 I bought 6 of these computers at the same time. Four out of 6 identical computers started to turn itself off during weekend or after long inactivity like vacation.
 So far I looked at two PCs and they seems to have something in common. Please see below events:
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6/22/2013 7:43:09 PM
The system is entering sleep.
Sleep Reason: System Idle

6/22/2013 7:43:07 PM
The system time has changed to ?2013?-?06?-?22T23:43:07.469000000Z from ?2013?-?06?-?22T23:43:07.469324700Z.

6/22/2013 7:23:32 PM
The WinHTTP Web Proxy Auto-Discovery Service service entered the stopped state.

6/16/2013 3:22:39 AM
The TCP/IP NetBIOS Helper service entered the stopped state.

6/16/2013 3:22:39 AM
The system is entering sleep.
Sleep Reason: System Idle

6/16/2013 3:22:35 AM
The system time has changed to ?2013?-?06?-?16T07:22:35.518000000Z from ?2013?-?06?-?16T07:22:35.518409200Z.
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I spoke to DELL technician, but they were not much help.

Today I disabled "Deep Sleep Control" in BIOS / Power Section. It was at "Enabled in S5 only" whatever that means ...  We will see how it goes.

Can you help?
sgleeAsked:
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nobusConnect With a Mentor Commented:
did you check the power options?  set them to never turn them off, to save power
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dheiertConnect With a Mentor Commented:
Make sure the BIOS is up to date on all of them as well.  Turn off any power saving configs in the OS.
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sgleeAuthor Commented:
BIOS UpdateThere are no BIOS updates available on this model yet.
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Danny ChildIT ManagerCommented:
Here's some explanation on the Sleep states:
http://www.intel.com/support/network/sb/cs-008459.htm

S0 - On and fully operational.
S1 - System is in low power mode (sleep mode). The CPU clock is stopped, but RAM is powered on and being refreshed.
S3 - Suspend to RAM (standby mode). Most components are shutdown except RAM.
S4 - Suspend to disk (hibernate mode). The memory contents are swapped to the disk drive, and then reloaded into RAM when the system is awakened.
S5 - Power off.

We've got some some 790s at work, I'll take a look if I can...
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sgleeAuthor Commented:
@ DanCh99
Do you think S1-5 settings have something to do with this problem?
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sgleeAuthor Commented:
I did not see such an option.
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nobusCommented:
no?   not in control panel?  what OS do you have?
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dheiertCommented:
Go through display properties and screen saver to get to the options.
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sgleeAuthor Commented:
Power SettingsDisplay SettingsIt has Windows 7 64bit OS and here are power and display settings.
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dheiertCommented:
OK, so set hibernate=never in all cases.  Sleep=never.
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sgleeAuthor Commented:
Power OptionsIs this good?
Do u think this caused the computer to turn itself off after so many hours of inactivity?
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dheiertCommented:
That should do it although I can't see if there are more options.  Yes, any setting that allows sleep or hibernate after X time of inactivity is making them sleep.
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sgleeAuthor Commented:
I will try this setting on all DELL PCs and report back next Monday.
On this particular machine since the user is on vacation this week, I can probably tell by Friday if it works or not.
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dheiertCommented:
Sounds good to me.  Dig as deep into the power settings as you can and set everything for power always on.
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nobusCommented:
As i asked you to do
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sgleeAuthor Commented:
@nobus  -- You are right. You said it. I never thought to check the additional power settings.
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sgleeAuthor Commented:
The computers stayed turned on over the weekend.
Thank you for your help.
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sgleeAuthor Commented:
Another comment about DELL tech support from India ...
They were totally useless. They should have known the default settings of 1080 minutes for hybernation. It is their product.
They got me waste time. I was frustrated and finally ended up opening the case at EE.
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