Multiple computer power issues.

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oscarjervis

Commendable
Mar 11, 2016
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I have been experiencing many odd power problems as of late with my computer. Once plugged in, the computer won't start for about an hour and once it does, the BIOS is reset to default settings. Furthermore, once shut down the computer will automatically start up at a random time between 10 and 11 pm. Any help would be appreciated.

My setup:
Motherboard: Asus H81i-PLUS
Graphics Card: NVIDIA GeForce GTX 970 Strix Graphics Card
Processor: Intel i5
Power Supply: Corsair CP-9020015-UK CX750 Builder Series ATX/EPS 80 Plus Bronze PSU
 
Solution
Darkbreeze
Try a different PSU if you have or can borrow one. I'd also consider replacing the CMOS battery. Time should not be affected no matter what is going on with the PSU. That's the whole point of having the cmos battery, so that if there is no power, it doesn't lose it's real time clock or settings.
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First, I'd disable fast restart/hybrid sleep in control panel, as follows:

[video="https://www.youtube.com/watch?v=KcBuiMAPCAA&feature=youtu.be"][/video]



Then I'd go into the bios and disable all of the wake on lan options. Do the same in control panel device manager. In the network adapter properties uncheck "allow this device to wake the computer" and in it's advanced properties tab if there are various "wake" settings, like "wake on magic packet" etc., I'd disable those as well.

Do those things, especially the fast restart disable, and then let me know how it goes afterwards.

 
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Thanks for the help! Unfortunately I've done all the things stated in your reply and problems still persist: frequent times where the computer will fail to turn on, and when turned on the BIOS is reset, additionally will turn it's self on through the night from shutdown.
 
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I've tested the power supply, and even gone as far as to buy a new one with no difference. something to note that it'll start up roughly one hour after shutdown, with the 'press f1 to recover BIOS settings' screen, with all bios settings reset to default.
 
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I think the next thing I'd try is replacing the cmos battery, as bios settings that don't "stick" are usually due to a faulty or old battery.

I'd also make sure that cmos reset jumper on the motherboard isn't for some reason in the "clear" position but is on the default pins.

This is a very unusual issue. It might simply be that the motherboard has failed, but I've never seen one fail in this weird way before.
 
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i replaced the cmos battery with no luck /: no change whatsoever but i don't seem to have any pins for jumpers at all. i know where theyre supposed to be, and there are no jumper pins or caps
 
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If none of the other suggestions work, I would try substituting another power supply and see what happens. A lot of times, erratic operation is due to failing electrolytic capacitors in the power supply or on the motherboard. Google "Capacitor Plague" and read the information. Then inspect all electrolytics on your motherboard, all plug-in cards, and also inside the power supply. Compare what you see with the photos to check for venting or leakage.
 
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Just to clarify, do you mean to say that once you press the power button to start the machine, one hour later it powers up, or one hour later it finishes booting and makes it into windows? Not sure EXACTLY what the behavior is. You say after plugging it in it takes one hour. Is there a reason you are unplugging the machine? Is it because it powers up by itself if you don't?

 
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to clarify, if unplugged from a power source, once you plug it back in it will take roughly an hour to be able to be turned on. if you try to press the power button before that, nothing will happen. however, once you have waited an hour or so, and turn on the computer, it will show an error screen saying 'press f1 to recover bios settings' but once you press f1 to inspect the BIOS all settings are reset, and the time remains at the time it was shut down, and counts up from that once you start it up.

this will also happen if you shut down the computer while still linked to a power source, that roughly an hour after you have shut it down totally, it will start back up automatically with a normal beep like an average startup. (it will show the bios f1 error screen)

thanks for your help :)
 
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Again, your recent post points to defective electrolytic capacitors. When a fault conditions exists, the period of time when the computer refuses to behave correctly provides time for over-heated parts to cool. Sometimes even though a electrolytic is venting or leaking, it will limp along if allowed to cool down. In extreme cases, they will vent and leak, perhaps even exploding.
 
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Try a different PSU if you have or can borrow one. I'd also consider replacing the CMOS battery. Time should not be affected no matter what is going on with the PSU. That's the whole point of having the cmos battery, so that if there is no power, it doesn't lose it's real time clock or settings.
 
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Solution
He says he replaced the PSU, which also implies a re-seat of all power cables.
I would replace the CMOS battery. Reset the BIOS to defaults after you do that.
Recheck that "hybrid sleep" setting; I had a system that was also arbitrarily waking up until I turned this off (sometimes within minutes of being shut down).
If you have installed Intel Smart Connect, remove it. That's software that wakes up a system periodically to check email, social network feeds, etc.
 
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