PC keeps swiching off and on by itself.

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Ninjabear

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I recently formatted my pc using Killdisk and started afresh with Windows 10. The OS is from Microsoft so there should be no issues there. I installed all the latest windows 10 drivers and everything was working fine.

Then yesterday I tried to bring the pc out of standby and after 5 seconds it shutdown. Then it turned back on again, then shut down again! I thought this might be some sort of standby issue so I unplugged the pc for a few minutes to simulate a full shutdown, but this didn't help either. Eventually I got it to boot back on and the problem appeared to be fixed but then it happened again today. I've tried opening up the side and checking all connections but everything appears to be plugged in as normal.

All the temperatures are running very cold as normal for cpu/gpu etc so it's not that.

At the moment I feel it could be the psu, but it runs fine for 10 hours or more as long as you don't shut it down. Any ideas?

Hardware spec
Windows 10 Pro
Sapphire PCI Express R7 260X 2GB Graphics Card (OC GDDR5, HDMI, DVI, DP, 2S)
Sandisk 240Gb SSD SDSSDX-240G-G25
Intel i5-4690 Haswell Refresh 3.50ghz
HyperX 8gb 2400mhz CL11 DDR3 HyperX Beast
Gigabyte GA-Z97M-DS3H rev 1001 (1.1)
Coolermaster 650w GX (CM Rs650-acaad3-uk gx 8)
Cooler Master Silencio 550 Silent Tower Case
 
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jr9

jr9

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- Recommend trying a different PSU.

- Temps should not have anything to do with the issue if the PC was asleep. The only part of the PC with power would have been the RAM.

- Try removing the graphics card and using integrated graphics for a while and see if the problem stops.
 
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Ninjabear

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At the moment it's leaning in the direction of buying a new PSU. I'll have a go at your suggestion of removing the graphics card as well.
 
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Ninjabear

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So this evening I removed the graphics card and also removed a small amount of dust from the insides but the issue is exactly the same.

This has never happened before on this computer so it seems like a bit of a coincidence that it does so just after installing Windows 10 for the first time. I keep thinking it could be something to do with secure boot or some other fast boot function only present in the newer OS. What do you think?
 
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Ninjabear

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The power supply was replaced with a new one.

A quick warning about the Coolermaster RMA department. I sent them a 80+ bronze and they replaced it with a 80+ white with only a 3yrs warranty. They also expect you to send it back at cost to yourself to the Netherlands! The old RMA scam trick: Stick your returns department in a far away location and then charge the customer for the return, despicable. The one I bought is a Corsair who have a returns department in the UK- where I live!

Update: Cancel that. After doing a test of standby mode the problem is back today :(
I'm going to try to repair the MBR in windows 10, aparently the PSU was fine (but was nevertheless replaced by Cooler Master with a new one..
 
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Ninjabear

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It's finally over! Tonight a new motherboard arrived and I spent the entire evening doing a full motherboard replacement. Touch wood everything is fine now.

The only remaining issue is that when I switch on the system I get a single but higher pitched beep then normal. The new mobo is an Asus H81M-Plus. I don't know which Bios it has and therefore can't lookup the meaning of the beeps. Can anyone help with this please?
 
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jr9

jr9

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Does it actually just beep once but boot up normally otherwise? Or is it failing to boot? Is it a long beep that doesn't stop?

Generally a single short beep means POST was successful. This is fairly universal across all motherboards. If you hear this but no picture is on the display I would make sure the display is correctly connected to the graphics card or motherboard video port (HDMI, DVI, VGA).
 
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Ninjabear

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It just boots up normally after a single high-pitched beep, everything is fine (gratefully). I thought maybe 1 high-pitched beep was different to 1 low pitched beep but now I think it's just how this motherboard works.
 
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jr9

jr9

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That one beep is normal. All it's telling you is that everything is fine and it made it through POST. If the pitch changes then it may be just a weird speaker. Generally motherboard speakers only have one pitch. Pitch varies from speaker to speaker.
 
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Ninjabear

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Thinking about it I used the speaker from the old mobo, new one didn't seem to have one.
 
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Ninjabear

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Jul 29, 2007
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Thinking about it I used the speaker from the old mobo, new one didn't seem to have one.
 
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