# Need Help with UR Robot Issue - Communication Error and Initialization Problem (Issue C4A90)

**URL:** <https://forum.universal-robots.com/t/need-help-with-ur-robot-issue-communication-error-and-initialization-problem-issue-c4a90/31539>\
**Category:** Technical Questions\
**Created:** [November 23, 2023, 10:09am UTC](https://forum.universal-robots.com/t/need-help-with-ur-robot-issue-communication-error-and-initialization-problem-issue-c4a90/31539 "2023-11-23T10:09:16Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![rlawogns1204](https://avatars.discourse-cdn.com/v4/letter/r/bb73d2/32.png) [@rlawogns1204](https://forum.universal-robots.com/u/rlawogns1204)\
**Post date:** [November 23, 2023, 10:09am UTC](https://forum.universal-robots.com/t/need-help-with-ur-robot-issue-communication-error-and-initialization-problem-issue-c4a90/31539/1 "2023-11-23T10:09:16Z")

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Hello everyone,

I am seeking urgent help with a recurring issue on our UR CB3 robot. Here are the details:

**Robot Model and Software Versions Tried:**

- Robot Model: CB3.
- Software Versions: Tried updating from 3.11 through to 3.15.8.

**Issues Faced:**

1. **Safety Confirmation Alert** : Upon starting, the robot displays a “The Robot cannot proceed with normal operation: Confirming safety” message.
2. **Initialization Problem** : In the ‘Initializing’ page, when I press ‘On’, I hear a noise from Joint 4, as if it’s trying to rotate, but the ‘Power On’ remains yellow, not turning green. The ‘Start’ button stays inactive, preventing any operation.
3. **Temporary Fix** : Yesterday, after hitting the robot a few times and rebooting, it surprisingly started working, but this is obviously not a viable long-term solution.

I would greatly appreciate any insights or advice on these issues. Has anyone experienced similar problems or have suggestions on how to resolve them?

Thank you in advance for your assistance!