# 3D Slicer Does Not Open

**URL:** <https://discourse.slicer.org/t/3d-slicer-does-not-open/17829>\
**Category:** Support\
**Created:** [May 27, 2021, 2:27pm UTC](https://discourse.slicer.org/t/3d-slicer-does-not-open/17829 "2021-05-27T14:27:55Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Panos\_Pap](https://avatars.discourse-cdn.com/v4/letter/p/c5a1d2/32.png) [@Panos\_Pap](https://discourse.slicer.org/u/Panos_Pap)\
**Post date:** [May 27, 2021, 2:27pm UTC](https://discourse.slicer.org/t/3d-slicer-does-not-open/17829/1 "2021-05-27T14:27:55Z")

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Hi,  
I’d like to ask why I cannot open the 3D slicer. Until yesterday I was working normally. Today I’m trying to open it and the program does not correspond at all. I added some extentions lately but I restarted the software as it mentioned and the program operated normally.  
Any ideas?  
Thank you.

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<div class="post-metadata">

**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [May 28, 2021, 8:51pm UTC](https://discourse.slicer.org/t/3d-slicer-does-not-open/17829/2 "2021-05-28T20:51:59Z")

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Probably your settings have become corrupted (because of instability caused by an extension, incorrect application shutdown due to multiple monitors, sleep mode, etc.). See troubleshooting instructions [here](https://slicer.readthedocs.io/en/latest/user_guide/get_help.html#slicer-application-does-not-start).