# usb interface of the qc suddenly stopped working 

**URL:** <https://unity.neuraldsp.com/t/usb-interface-of-the-qc-suddenly-stopped-working/11328>\
**Category:** Bug Reports\
**Created:** [June 24, 2023, 7:08pm UTC](https://unity.neuraldsp.com/t/usb-interface-of-the-qc-suddenly-stopped-working/11328 "2023-06-24T19:08:50Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![WienerDogStudios](https://sea2.discourse-cdn.com/flex020/user_avatar/unity.neuraldsp.com/wienerdogstudios/32/9081_2.png) [@WienerDogStudios](https://unity.neuraldsp.com/u/WienerDogStudios)\
**Post date:** [June 24, 2023, 7:08pm UTC](https://unity.neuraldsp.com/t/usb-interface-of-the-qc-suddenly-stopped-working/11328/1 "2023-06-24T19:08:50Z")

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**CorOS Version:** 2.0.3

**Describe your issue:**  
I have a big problem. My QC won’t show up as a usb interface. On the QC in I/O settings the usb port is/becomes (if I plug it into a pc) white (so it should have a connection), but no PC/Mac iPad shows it as an audio output/input option.  
I tried different cables, shutting it down and unplugging the power and restarting it with the usb plugged in, but nothing works.  
It worked fine yesterday, but now I’m not able to use it as an interface. Everything else works fine, but I depend on the QC as my main audio interface for recording guitars.

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<div class="post-metadata">

**Author:** ![MP\_Mod](https://avatars.discourse-cdn.com/v4/letter/m/ccd318/32.png) [@MP\_Mod](https://unity.neuraldsp.com/u/MP_Mod)\
**Post date:** [June 24, 2023, 7:11pm UTC](https://unity.neuraldsp.com/t/usb-interface-of-the-qc-suddenly-stopped-working/11328/2 "2023-06-24T19:11:12Z")

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I would definitely email [support@neuraldsp.com](mailto:support@neuraldsp.com) so they can log the issue and provide resolution.  
Lastly, you might try backing up the QC, perform a factory reset and restore your backup.