Problem Cause Solution
d. Continue adding devices one at a time to verify
that all devices are functioning.
2. Verify power supply functionality (Tower only).
a. Disconnect AC power.
b. Unplug all system board power cables.
c. Plug in AC power.
●
If the PSU fan spins and the LED is
illuminated (see
Testing power supply
on page 89), the power supply is good.
Replace the system board.
●
If the PSU fan does not spin or the LED
does not illuminate (see
Testing power
supply on page 89), replace the power
supply.
90 Chapter 4 Diagnostics and troubleshooting
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