High pitch sound and motherboard lights

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Lukeus699

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Jul 23, 2016
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If anyone can help thanks a lot.

Sorry if this seems brief and a little confusing but it's currently 2 am here and I'm being kept awake by an annoying issue.

I just had my pc upgraded, however upon turning off the device and getting into bed I noticed that the Mobo was still receiving power and that the ethernet cable was flickering, so I went to inspect behind the pc, then I could hear a sort of high pitch, faint squeeling coming from the back.

i turned off the pc by the psu button and the light went off shortly after, the sound then continued to both raise and lower is pitch, before stopping completely. (same sound when you're ear is ringing, but no its not my ear haha)

Both the Mobo and psu are brand new and I dunno what the issue is? I then turned the computer back up, entered the bios and when I pressed exit the computer reset and turned off before turnbuckle on.

I checked the voltage ect but I don't know what is too high/low for the components.

My specs are:

Intel i5 4690k
Mobo Asus z97 pro gamer
Xfx 650w xtr psu
Gigabyte geforce 1070
Ram low vengeance 2x4gb

 
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TMTOWTSAC

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Jun 27, 2015
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Would you feel comfortable checking the PSU by itself? I usually associate a high pitched whine with DC converters. Cheap power bricks usually, but more rarely a failing component like a PSU. A small amount of noise is normal but unless it's really bad you usually can't hear anything over the fan. If it is the PSU, that's absolutely grounds for an RMA.
 
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Lukeus

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I would if it meant resolving the issue. I seen a lot of people say it's from low end psu but this one is reviewed very well. See their isn't a sound when the computer is running, the psu has a smart fan switch so the psu fan isn't on when idel. However the sound only begins once the computer has shut down? (Ram?)
 
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TMTOWTSAC

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Even high end PSU's can go bad, or ship a faulty unit. It happens, and doesn't mean it was a bad choice. Anyway, it sounds like you got a unit with a bad case of coil whine. If you're comfortable doing a "psu paperclip test" you could pull the PSU out and try it to see if it makes the noise when not connected to anything.

(Disclaimer here, if you're not comfortable don't do it. Take precautions, safe surface, gloves, don't touch anything but the power switch until it's physically unplugged, etc)

Before you do that though, try googling "coil whine psu" and listening to some recordings. If that's what you're hearing and the sound is coming from the PSU, you should be able to exchange it without any fuss. That having been said, some combinations of hardware just seem to produce whine even when the same components in different systems don't.
 
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Lukeus699

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I am just unsure as to why the motherboard still recives power for a few seconds even after the switch has been turned off, this is when the sound gets very noticeable and changed dramatically
 
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Lukeus699

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So I just shut down the pc, turned off the psu and unplugged the cable, all within a few seconds, however even after the cable was removed the motherboard was still lit up and the sound still continued
 
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TMTOWTSAC

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Lights staying on for a few seconds is normal. Even some of the new LED light bulbs glow for a second or two after hitting the light switch. Can you tell where the sound is coming from exactly? The PSU is still the most likely source. But if it is coming directly from the motherboard, can you tell what part is making the noise?
 
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Lukeus699

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So even tho the computer has no connection to the wall, the motherboard is using the extra watts in the unit? And the sound is extremely hard to pin point, it's definitely most noticeable near the psu/bottom left of the motherboard. It stays at a steady eeeeee until I unplug it, then goes wild for about 10 seconds, driving me metal
 
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TMTOWTSAC

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The "extra watts" you're referring to are most likely stored in the motherboard itself. I think it's technically possible for them to be coming from the PSU instead, or in addition to, but I'm not sure about that. Regardless, the PSU would be the most likely culprit here.
 
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