# Troubleshooting a Failed Camera Board on the NextSeq 500/550

The following error can occur at the very beginning of a sequencing run or while the run is progressing and will cause the run to stop.

The error message states: "All cameras disabled Originally caused by: Failed Camera Board."

**Possible causes:**

* Transient communication issues.
* A loose connection from the camera board.
* A hardware failure at Main Printed circuit Assembly (MPCA).

**Troubleshooting steps:**

1. Power cycle the NextSeq 500/550.\\\*
2. If the system initializes without errors, run the Flow Cell Registration Test.
   1. Navigate to **Manage Instrument** > **System Check**, and select the **Flow Cell Registration Test**.
      1. If the flow cell registration test passes without errors, proceed with setting up the next run and monitor the run performance.
      2. If a similar error appears at any stage, contact [Illumina Technical Support](https://sapac.illumina.com/company/contact-us.html#/united-states/technical-support).

\\\*For further information, search for Knowledge Base article **How to Perform a NextSeq 500/550 Power Cycle.**

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