Sun Microsystems Ultra 20 User Manual page 27

Caution – Some components, such as the heatsink, can become extremely hot
during system operations. Allow these components to cool before handling them.
5. Verify that the components are fully seated in their sockets or connectors and that
the sockets are clean.
6. Verify that all cables inside the system are firmly attached to their appropriate
connectors.
7. Replace the left-side panel.
8. Reconnect the system and any attached peripherals to their power sources, and
then power them on.
Chapter 2 Troubleshooting 2-3