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## How to Inspect the Inside of the Server

1. Prepare the server for service. See Preparing the Server for Service and Operation in Sun Fire X4640 Server Service Manual.
2. Choose a method for shutting down the server from main power mode to standby power mode.

   - Graceful shutdown: Use a ballpoint pen or other nonconducting stylus to press and release the Power button on the front panel. This causes Advanced Configuration and Power Interface (ACPI) enabled operating systems to perform an orderly shutdown of the operating system. Servers not running ACPI-enabled operating systems will shut down to standby power mode immediately.

   - Emergency shutdown: Use a ballpoint pen or other nonconducting stylus to press and hold the Power button for four seconds to force main power off and enter standby power mode.

     When main power is off, the Power/OK LED on the front panel will begin flashing, indicating that the server is in standby power mode.

     | Caution - When you use the Power button to enter standby power mode, power is still directed to the service processor board and power supply fans, indicated when the Power/OK LED is flashing. To completely power off the server, you must disconnect the AC power cords from the back panel of the server.

3. Remove the server cover, as required.

   For instructions on removing the server cover, refer to the Sun Fire X4640 Server Service Manual.

4. Inspect the internal status indicator LEDs, which can indicate component malfunction.

   Note - The server must be in standby power mode to view the internal LEDs.

   For the LED locations and descriptions of their behavior, see Troubleshooting DIMM Problems.

   Note - You can hold down the Locate button on the server back panel or front panel for 5 seconds to initiate a “push-to-test” mode that illuminates all other LEDs both inside and outside of the chassis for 15 seconds.

5. Verify that there are no loose or improperly seated components.
6. Verify that all cable connectors inside the system are firmly and correctly attached to their appropriate connectors.
7. Verify that any after-factory components are qualified and supported.

   For a list of supported PCI cards and DIMMs, refer to the Sun Fire X4640 Server Service Manual.

8. Check that the installed DIMMs comply with the supported DIMM population rules and configurations, as described in Troubleshooting DIMM Problems.
9. Replace the server cover.
10. To restore main power mode to the server (all components powered on), use a ballpoint pen or other nonconducting stylus to press and release the Power button on the server front panel.

    When main power is applied to the full server, the Power/OK LED next to the Power button blinks intermittently till BIOS post finishes.

11. If the problem with the server is not evident, you can try viewing the power-on self test (POST) messages and BIOS event logs during system startup.

    Refer to Sun Fire X4640 Server Service Manual for more information on POST and BIOS event logs.

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