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How long can a computer be in sleep during a power outage??


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#1 bc0306

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Posted 23 August 2017 - 02:57 PM

I was sleeping today, when I woke up I found there was a power outage, the night before, I left the computer on, I have it configured to go to sleep in 30 minutes of inactivity, so it obviously went to sleep, when I came to computer the led on the power button was blinking indicating that it was sleeping, but I was confused, there was a power outage and I saw my computer led status saying it was sleeping, for further tests, I plugged in to the ac a multimeter, indicating there was 6 volts ac, yes there was 6 volts only during the power outage.

When power was restored, I powered my computer and sure, everything was as if it went to sleep.

 

So I'm considering 2 possibilities:

 

1. The system could have been feeding of the energy of the capacitors in the psu

 

or

 

2. The psu could have directed those 6 volts ac to keep on the ram with power and power the led up

 

What do you think?

 

 

BTW:its a dell dimension 9200


Don't even think about it if your not sure


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#2 mikey11

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Posted 23 August 2017 - 03:17 PM

how long was the power out for?

 

if the power just flashes off and on quickly it may not have any effect on your computer



#3 bc0306

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Posted 23 August 2017 - 03:33 PM

out for aproximately 4 hours


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#4 The-Toolman

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Posted 23 August 2017 - 04:19 PM

Is the computer plugged into a battery backup.


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#5 britechguy

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Posted 23 August 2017 - 05:29 PM

"I plugged in to the ac a multimeter, indicating there was 6 volts ac, yes there was 6 volts only during the power outage."

 

Six volts from what?  If you had a full outage it certainly wouldn't have been from your AC outlets.  In looking at the replacement power supplies for this machine there was apparently some form of motherboard in some of them that used +12VDC, and if that's in yours then sleeping on 6 volts should be a cinch.


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#6 bc0306

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Posted 23 August 2017 - 09:00 PM

six volts from the outlet on my house, transformers here in mexico arent really good quality, they blow up sometimes, i only have my computer plugged into an electronic tension regulator, otherwise known as surge protectors, its connected to a koblenz power surge protector, a fat one, but defenitly not a ups.


Don't even think about it if your not sure


#7 HyperHenry

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Posted 23 August 2017 - 11:48 PM

You didn't mention if you tried to start it up. If you tested it as it was it is probably from the capacitors. The PSU couldn't have directed any power if it wasn't receiving any.



#8 bc0306

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Posted 24 August 2017 - 02:32 PM

 

When power was restored, I powered my computer and sure, everything was as if it went to sleep.

 

 

 

I did, but during the outage, the outlet was only supplying 6 volts ac out of 120v ac.


Don't even think about it if your not sure


#9 britechguy

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Posted 24 August 2017 - 03:31 PM

Another thing I hadn't thought of, but the sleep setting also has an "auto-hibernate" feature on laptops at least if there is an imminent chance of losing battery power entirely.  It makes me wonder if your machine didn't actually hibernate at some point, but that would still require power to complete the hibernation.

 

This quite handy behavior you had is mysterious.


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#10 bc0306

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Posted 24 August 2017 - 04:53 PM

As I said, the pc led status was still blinking, indicating it was in sleep mode, during the outage.


Don't even think about it if your not sure





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