# Core not glowing

**URL:** <https://community.particle.io/t/core-not-glowing/9218>\
**Category:** Troubleshooting\
**Created:** [January 8, 2015, 1:08am UTC](https://community.particle.io/t/core-not-glowing/9218 "2015-01-08T01:08:30Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![tim1](https://avatars.discourse-cdn.com/v4/letter/t/b782af/32.png) [@tim1](https://community.particle.io/u/tim1)\
**Post date:** [January 8, 2015, 1:08am UTC](https://community.particle.io/t/core-not-glowing/9218/1 "2015-01-08T01:08:30Z")

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I connected the core and did smart config. Then I wrote a simple program and flashed it. During the flashing process, the core suddenly stopped - all lights were gone.

Did I burn it?

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**Author:** ![kennethlimcp](https://avatars.discourse-cdn.com/v4/letter/k/c0e974/32.png) [@kennethlimcp](https://community.particle.io/u/kennethlimcp)\
**Post date:** [January 8, 2015, 1:20am UTC](https://community.particle.io/t/core-not-glowing/9218/2 "2015-01-08T01:20:38Z")

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Guess not! Can you try performing a factory reset? Hold down both buttons, release only the RST and wait till the core blinking white rapidly.

It should enter Listening mode (blinking blue) after that.

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**Author:** ![Dave](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/dave/32/181_2.png) [@Dave](https://community.particle.io/u/Dave)\
**Post date:** [January 8, 2015, 3:07pm UTC](https://community.particle.io/t/core-not-glowing/9218/3 "2015-01-08T15:07:08Z")

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Here’s a video showing how to do a factory reset, it can be tricky the first time:

Thanks,  
David

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**Author:** ![tim1](https://avatars.discourse-cdn.com/v4/letter/t/b782af/32.png) [@tim1](https://community.particle.io/u/tim1)\
**Post date:** [January 8, 2015, 4:03pm UTC](https://community.particle.io/t/core-not-glowing/9218/4 "2015-01-08T16:03:48Z")

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Thanks, that worked