Lenovo IdeaCentre D400 Series Hardware Maintenance Manual page 21

5. Look at the following conditions and follow the instructions:
6. Inspect internal components and cables
7. If you cannot continue, replace the last device tested.
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• If an error code is displayed during POST, go to "POST error codes"
• If the home center hangs and no error is displayed, continue to step 7.
a. Power off the home center and all external devices.
b. Unplug all cables and power cord.
c. Place the home center on a flat, stable surface.
d. Remove the cover. Refer to "Removing the cover".
e. Verify that components are properly seated.
f. Verify that all cable connectors inside the system are firmly and correctly
attached to their appropriate connectors.
g. Replace the cover.
h. Power on the home center.
Chapter 4. General checkout