Check Procedures 2-41
006 -  ARE THE VOLTAGES CORRECT AND DOES THE FAN RUN?
(YES, READ AHEAD.  NO, GO TO STEP 009)
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The power supply is working normally.
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If you suspect the on/off switch cable assembly, see Step 003.
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If the fan continues to run when all connectors are plugged back in,
go to “Undetermined Problems” on page 2-44.
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If the fan stops running when a drive connector is plugged back in,
go to "Start" on page 2-3.
007 -  DO YOU HAVE AN OHM READING WHEN THE SWITCH IS
PRESSED AND AN OPEN READING WHEN THE SWITCH IS
RELEASED? (YES, READ AHEAD.  NO, GO TO STEP 008)
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Replace the on/off switch cable assembly.
008 -
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Replace the system board.
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End.
009 -
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Replace the power supply.
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End.