# Teensy 4.1 not responding

**URL:** <https://community.sparkfun.com/t/teensy-4-1-not-responding/47115>\
**Category:** Teensy\
**Created:** [March 14, 2024, 3:52pm UTC](https://community.sparkfun.com/t/teensy-4-1-not-responding/47115 "2024-03-14T15:52:10Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![MacsTech](https://avatars.discourse-cdn.com/v4/letter/m/f05b48/32.png) [@MacsTech](https://community.sparkfun.com/u/MacsTech)\
**Post date:** [March 14, 2024, 3:52pm UTC](https://community.sparkfun.com/t/teensy-4-1-not-responding/47115/1 "2024-03-14T15:52:10Z")

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We have used for many times Teensy 3.6 and 4.1 with a custom firmware.

The Teensy are connected via USB to the PC, at this time the board is not yet used.

Using the same firmware all the 5 Teensy bougth are not working.

Not working means that we can flash correctly them (with teensy.exe) but after that they are not responding at any command.

Anu suggestion, test and help is appreciated. :roll:

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<div class="post-metadata">

**Author:** ![TS-Russell](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/ts-russell/32/6092_2.png) [@TS-Russell](https://community.sparkfun.com/u/TS-Russell)\
**Post date:** [March 14, 2024, 6:04pm UTC](https://community.sparkfun.com/t/teensy-4-1-not-responding/47115/2 "2024-03-14T18:04:42Z")

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Run through the steps here [https://www.pjrc.com/teensy/troubleshoot.html](https://www.pjrc.com/teensy/troubleshoot.html) and see if that and/or using the push button helps things along