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## Locate a Faulty Main Module Motherboard

The following LEDs are lit when a main module motherboard fault is detected:

- System Service Required LEDs on the front panel and rear I/O module

- Service Required LED on the main module

1. Determine if the System Service Required LEDs are lit on the front panel or the rear I/O module.

   See Interpreting Diagnostic LEDs.

2. From the front of the server, check the main module LEDs to determine if the main module motherboard needs to be replaced.

   See Main Module Motherboard LEDs. The amber Service Required LED will be lit on the main module if the main module motherboard needs to be replaced.

3. Remove the main module and replace the main module motherboard.

   See Remove the Main Module Motherboard.

##### Related Information

- Main Module Motherboard Overview

- Main Module Motherboard LEDs

- Remove the Main Module Motherboard

- Install the Main Module Motherboard

- Verify Main Module Motherboard Functionality

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