Checking the AC Adapter

1.  If any noise can be heard from the AC adapter when it is  plugged into the ac power outlet, replace the AC adapter.

   If no noise can be heard from the AC adapter,  go to step 3.

2.  If a noise is still heard from the new AC adapter, suspect  the computer. Replace the AC adapter with the original one, then  go to the next step. If no noise is heard from the new AC adapter,  the original AC adapter is defective.
3.  Unplug the AC adapter cable from the computer and  measure the output voltage at the plug of the AC adapter cable.
    
   

   Pin	Voltage (Vdc)
   1	+19.0 to +21.0
   2	Ground

    

   •  If the voltage is not correct, go to the next step.

4.  Unplug the AC adapter cable from the ac power outlet and wait for  a few minutes.
5.  Plug the AC adapter cable into the ac power outlet.
6.  Measure the output voltage of the AC adapter.

   •  If the voltage is still not correct, replace the AC adapter.
   •  If the voltage is correct, plug the AC adapter  cable into the computer and try the failing operation again.
   •  If the problem goes away, suspect the continuity or installation  of the AC adapter cable.
   •  If the problem is not corrected, replace the voltage converter.

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