If you encounter an error
condition, complete the following steps before starting problem isolation procedures:
1.Ensure proper ventilation. The computer should have a 3-inch (7.6-cm) clearance
at the back of the system unit.
2.Turn off the computer and peripheral devices.

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CAUTION:Make sure the power is off before
disconnecting or reconnecting the mouse, keyboard, or any other peripheral devices.
Disconnecting or connecting peripheral devices while the unit power is on can damage the
system board. |
3.Disconnect any peripheral devices other than the monitor and keyboard. Do not disconnect
the printer if you want to test it or use it to log error messages.
4.Install loop-back and terminating plugs for complete testing.
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