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Maximus VII Hero random loss of power / power off

Level 7
Hello there,

It started like a week ago, it does this once a day or twice and it doesn't matter what I'm doing, gaming, browsing etc, so it's not temperature or load related.

The power off isn't a windows crash, or a BSOD and it has no warning, it's a clean complete loss of power JUST AS if the power for the house went out or I unplugged from the wall.
it's sharp and sudden, and completely random.

Naturally I have tried a bunch of things already: (PC specs on the left under my name)

- Take one RAM out, take the other, switch ram slot positions etc
- wiggle around the PSU cables to see if one was loose, reattach all of them.
- take out GPU.
- take out hard drives.
- load optimized defaults in BIOS, turn off surge protection (could be surge protection triggering but nope, still happens with it off)

I dunno what to do now... it really is mysterious, hope it's the PSU which is easier to replace, don't wanna misdiagnose and replace something more expensive like the mobo or the CPU...
even though the mobo is under warranty (purchased july 2014 ) , I'll check if the PSU is under warranty since it's corsair could be.

Also, I will flash the latest 3103 BIOS that came out some days ago see if it fixes it but I'm not hopeful. I'm on 3003 right now.


UPDATE: flashed 3103 no shutdowns till now but could happen later today or tomorrow so not definitive. I don't have a PSU to try out sadly, but I'll see what I can do.

UPDATE 2: Well no loss of power until now (april 28th) so could be that the BIOS update fixed it

Level 7
If you have another PSU try and see what happens. Logically if there are random shut down's i would first be checking the PSU.

Hi; I'm having the very same problem on my computer, with a Corsair 850i I bought last year.
Updating bios to latest version didn't change anything.
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I have the exact same problem. And a friend of mine too with identical specs as me. Happened for the last 6 months or so.

My Specs are:
MB: Maximus Hero VII Bios:3103
Processor: Intel Core i7-4790k 4ghz
Memory: 16gb ddr3
Display Device: Nvidia Geforce GTX 970 msi
Power supply: EVGA Supernova 750 g2

Would be great if someone could find some kind of solution. It's really annoying.

I've changed PSU to see what need to be fixed, but the computer turned off again. I think I'm gonna contact support and ask for RMA.
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jediknight16 wrote:
I've changed PSU to see what need to be fixed, but the computer turned off again. I think I'm gonna contact support and ask for RMA.

Seems it usually happens when watching video files or watching a streaming video in an online browser.
Also Maximus Hero VII Bios:3103 didn't work out very well for me.
I had to go back to 3003 because it kept freezing up the system too often and was causing noticeable lag in many applications.
Personally I haven't experienced any random loss of power anymore with Bios 3003 and a clean install of Windows 10.

Then you're very lucky. I had them with previous BIOS too, so I think it wouldn't change a thing for me to rollback.
I just don't know what to do to fix.
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I am having the exact same issue with the same motherboard: random reboots for no apparent reason.

I have checked everything: the temps, RAM, my HDD + SSD, and even my PSU. But the problem seems to be caused by a driver for the motherboard as mentioned here:

I am yet to find a fix and would appreciate if Asus helps us out here!

Level 7
I changed motherboard, issue fixed. Will ask for RMA in next days to send them their bad hardware.
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Level 10
The last time I had an issue like that it was caused by a loose wire in a power harness that was triggering the overload protection circuit on my ps. I pulled my hair out trying to figure it out until I checked each power plug and discovered the issue. Once I corrected the wires the issue never reoccurred and I would advise you to begin a systematic check of all power supply plugs to see if one is grounding your system out.
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