IBM 8849 Service Manual page 53

USB 1 connector
System error LED
Locator LED
Power-control button
Power-on LED
2. Read the safety information that begins on page "Safety" on page vii and
"Installation guidelines" on page 69.
3. Turn off the server and peripheral devices, and disconnect the power cord and
all external cables.
4. Remove the server from the rack and place on a flat, static-protective surface.
5. Remove the cover (see "Removing the cover" on page 72).
6. Reconnect all external cables and the power cord; then, turn on the server.
Attention: For proper cooling and airflow, replace the cover before turning on
the server. Operating the server for extended periods of time (more than 30
minutes) with the cover removed might damage server components.
Certain components inside the server have LEDs that will be lit to indicate the
location of a problem. For example, a DIMM error will light the LED next to the
failing DIMM on the system board.
7. Look at the system service label on the underside of the server cover, which
gives an overview of internal components. This information can often provide
enough information to correct the error.
The following illustration shows the LEDs on the system board.
USB 2 connector
Hard disk drive activity LED
Reset button
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Chapter 2. Diagnostics