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d. Remove the I/O module and install a working I/O module in the same I/O bay.
e. If the problem is solved, replace the I/O module that you removed.
Observable problems
Use this information to solve observable problems.
• "The compute node immediately displays the POST Event Viewer when it is turned on" on page 110
• "Compute node is unresponsive (POST is complete and operating system is running)" on page 110
• "Voltage planar fault is displayed in the event log" on page 111
• "Unusual smell" on page 111
• "Compute node seems to be running hot" on page 111
• "Cracked parts or cracked chassis" on page 111
The compute node immediately displays the POST Event Viewer when it is turned on
Complete the following steps until the problem is solved.
1. Correct any errors that are indicated by the light path diagnostics LEDs.
2. Make sure that the compute node supports all the processors and that the processors match in speed
and cache size.
You can view processor details from system setup.
To determine if the processor is supported for the compute node, see http://www.lenovo.com/
serverproven/.
3. (Trained technician only) Make sure that processor 1 is seated correctly
4. (Trained technician only) Remove processor 2 and restart the compute node.
5. Replace the following components one at a time, in the order shown, restarting the compute node each
time:
a. (Trained technician only) Processor
b. (Trained technician only) System board
Compute node is unresponsive (POST is complete and operating system is running)
Complete the following steps until the problem is solved.
• If you are in the same location as the compute node, complete the following steps:
1. If you are using a KVM connection, make sure that the connection is operating correctly. Otherwise,
make sure that the keyboard and mouse are operating correctly.
2. If possible, log in to the compute node and verify that all applications are running (no applications are
hung).
3. Restart the compute node.
4. If the problem remains, make sure that any new software has been installed and configured correctly.
5. Contact your place of purchase of the software or your software provider.
• If you are accessing the compute node from a remote location, complete the following steps:
1. Make sure that all applications are running (no applications are hung).
2. Attempt to log out of the system and log back in.
3. Validate the network access by pinging or running a trace route to the compute node from a
command line.
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ThinkSystem SN550 Compute Node Maintenance Manual
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