# It on, no it’s off, no it’s on just kidding

**URL:** <https://forum.onefinitycnc.com/t/it-on-no-it-s-off-no-it-s-on-just-kidding/19207>\
**Category:** Troubleshooting (X35/X50)\
**Created:** [March 5, 2023, 3:18am UTC](https://forum.onefinitycnc.com/t/it-on-no-it-s-off-no-it-s-on-just-kidding/19207 "2023-03-05T03:18:04Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![WaywardWoodworker](https://avatars.discourse-cdn.com/v4/letter/w/e79b87/32.png) [@WaywardWoodworker](https://forum.onefinitycnc.com/u/WaywardWoodworker)\
**Post date:** [March 5, 2023, 3:25am UTC](https://forum.onefinitycnc.com/t/it-on-no-it-s-off-no-it-s-on-just-kidding/19207/2 "2023-03-05T03:25:29Z")

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Seems like EMI from the router/spindle is affecting the monitor, it seems to be a common issue. There are many threads on the forums here about adding ferrite cores to the cables:

> [@Decided to get ferrite cores](https://forum.onefinitycnc.com/t/decided-to-get-ferrite-cores/11217):
>
> Where should I put them at to ensure that there is no EMI that can happen?

There are many more if you search for ferrite cores

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