# Photon flashing yellow

**URL:** <https://community.particle.io/t/photon-flashing-yellow/46587>\
**Category:** Troubleshooting\
**Tags:** photon\
**Created:** [December 27, 2018, 11:09pm UTC](https://community.particle.io/t/photon-flashing-yellow/46587 "2018-12-27T23:09:42Z")\
**Posts on this page:** 4\
**Page:** 2

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**Author:** ![nrobinson2000](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/nrobinson2000/32/15624_2.png) [@nrobinson2000](https://community.particle.io/u/nrobinson2000)\
**Post date:** [January 29, 2019, 9:21pm UTC](https://community.particle.io/t/photon-flashing-yellow/46587/21 "2019-01-29T21:21:59Z")

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1. That looks like magenta flashes and yellow flashing to me.
2. You can’t enter listening mode if the photon is already in dfu mode.
3. That looks identical to the first video

To me it looks like the SETUP button is damaged (stuck in the pressed position), which may explain why every time the Photon flashes magenta and yellow (light sequence of entering dfu mode) every time you power it up.

It could be a power issue or a bootloader issue. The photon may just be toast. 🤔

I just tried something with one of my photons. If I plug in the photon while pressing the SETUP button the photon will enter DFU mode, and I can list it in dfu even if I haven’t released my finger from the SETUP button.

Are you 100% sure you don’t see the photon when you do:

```auto
dfu-util --list

```

when the photon is connected and blinking yellow?

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**Author:** ![black\_a](https://avatars.discourse-cdn.com/v4/letter/b/f17d59/32.png) [@black\_a](https://community.particle.io/u/black_a)\
**Post date:** [January 29, 2019, 11:46pm UTC](https://community.particle.io/t/photon-flashing-yellow/46587/22 "2019-01-29T23:46:18Z")

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> [@nrobinson2000](#):
>
> dfu-util --list

Thank you for trying that! I just re-checked: `dfu-util --list` doesn't detect the photon.

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**Author:** ![mstanley](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/mstanley/32/20170_2.png) [@mstanley](https://community.particle.io/u/mstanley)\
**Post date:** [January 30, 2019, 10:26pm UTC](https://community.particle.io/t/photon-flashing-yellow/46587/23 "2019-01-30T22:26:11Z")

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Hey black\_a,

You mentioned other devices are flashing fine, and you believe it to just be this one. Should that be the case, I would of the opinion that it is possible this one may be defective.

Please submit a ticket with us [here](https://docs.particle.io/support/menu-base/) referencing this topic.

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**Author:** ![ParticleD](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/particled/32/17016_2.png) [@ParticleD](https://community.particle.io/u/ParticleD)\
**Post date:** [February 4, 2019, 12:07am UTC](https://community.particle.io/t/photon-flashing-yellow/46587/24 "2019-02-04T00:07:37Z")

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I have received his ticket and we’ll be sending him another Photon.

[Previous page](https://community.particle.io/t/photon-flashing-yellow/46587.md?page=1)