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I run a Toslink cable from my PC to my home theater receiver for sound. I shut the system down two nights ago and it was working fine. I booted it up the next morning and no sound. I tested the amp by switching it to the video input and using the separate Toslink from my cable companies set top box for the TV. The sound is there so the receiver is good.

I looked at the back of the PC, pulled out the Toslink cable and I don't see the red light. I then tested the headphone out and that works so the Realtec chip seems ok. Any ideas about this or do I need a new mobo?

This is the PC in my sig:

https://www.amazon.com/i7-4770T-2-5GHz-USB3-0-Barebone-ZBOX-IQ01-U/dp/B00H34D5YE

Bob


Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.
Help! Tech S.O.S (Off topic)
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I think you covered this in your testing, but did you actually try another optical cable? They can shatter.


BIAB 2026 Win Audiophile. Software: Fender Studio One 8, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Presonus Quantom HD8 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.
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I don't think it's the cable because when I said I didn't see a red light I meant in the port on the back of the PC. There's a little protective flap in there and when I pushed that back with a paper clip, it's dark. No red light which tells me that port has somehow died unless there's something I can do to try to reactivate it which is the reason for my question.

Thanks


Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.
Help! Tech S.O.S (Off topic)
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Too bad. No, I don't know how to reactivate that. Good luck.


BIAB 2026 Win Audiophile. Software: Fender Studio One 8, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Presonus Quantom HD8 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.
Help! Tech S.O.S (Off topic)
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Originally Posted By: jazzmammal
I don't think it's the cable because when I said I didn't see a red light I meant in the port on the back of the PC. There's a little protective flap in there and when I pushed that back with a paper clip, it's dark. No red light which tells me that port has somehow died unless there's something I can do to try to reactivate it which is the reason for my question.

Thanks
Try copying your motherboard settings then reset the motherboard back to defaults and (if needed) enable the toslink port. Also, visit the motherboard manufacturer website then checkout the FAQs, forum links, technical papers, etc to see if there is a solution.


Jim Fogle - 2026 BiaB (Build 1224) RB (Build 8) - Ultra+ PAK
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Help! Tech S.O.S (Off topic)
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When a digital audio device gets reset and then the sync rates between equipment don't match, sometimes I can't get a TOSLINK connection to work.

But I doubt this is it, because even then, "I see the light".


BIAB 2026 Win Audiophile. Software: Fender Studio One 8, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Presonus Quantom HD8 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.
Help! Tech S.O.S (Off topic)
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Some of you know I'm a tax guy so I've been buried up to my eyeballs and haven't had time to troubleshoot this. This morning I have a few minutes so I decided to go into Control Panel and see what I can find. What I found was a Realtek HD Audio Manager which I've never opened before. In there what do I see? The volume output is up full like it should be but it's MUTED!! Now the sound is back and the red light on the back of the PC is on so muting turns that off.

How did I miss that? I went back in and muted it again and then checked the icon in the taskbar. I'm pretty sure in other systems if it's muted there's a red X through the icon but now there isn't. I have to hover the mouse over it and a little blurb pops up saying Realtek HD Audio Output 100% Muted but no obvious X. You have to hover the mouse over it before you see that. Then I unmuted it again and figured out how to mute it from the taskbar icon and it's not a simple thing to do by mistake. You right click the icon, the little menu pops up and then you have to click Open Volume Mixer, then the click the speaker icon at the bottom of the volume slider in order to mute it.

In my OP I wrote the system was fine when I turned it off and went to bed and in the morning I turned it on and no sound and that's true so how did it mute itself? I would have had to do all that to deliberately mute it before I went to bed and I don't think I've ever muted the audio from any of my machines. Why would I do that? I go through a lot of effort to get my sound set up.

The good news is I don't have a problem except losing my mind...Jeesh

Bob


Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.
Help! Tech S.O.S (Off topic)
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Probably Windows did an update during the night?

Glad you figured it out!


BIAB 2026 Win Audiophile. Software: Fender Studio One 8, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Presonus Quantom HD8 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.
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That's it!!

Blame Microsoft, works for me. Thanks Matt.

Bob


Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.
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Very nice to know your Toslink connection is working again, yeah !!! Also good to read there is a setting to turn the port on and off without having to go into motherboard bios settings. Who would have thought?


Jim Fogle - 2026 BiaB (Build 1224) RB (Build 8) - Ultra+ PAK
DAWs: Cakewalk Sonar - Standalone: Zoom MRS-8
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