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Troubleshooting General/ Logic Board Troubleshooting - 19
other port can still be functional. These LEDs are not immediately
illuminated at the beginning of a restart or cold power-on. During
a successful/normal boot, the sequence will look like:
1. Unit is powered on and other LEDs will illuminate while DS4
and DS5 are off.
2. Then DS4 and DS5 on for a second or two
3. Then off very briefly (1 second)
4. Then back on (confirms secondary PCI bus is initialized and
power now available)
These two LEDs are often useful when troubleshooting an
unpredictable system. If they stay on (step 4) then the secondary
PCI bus has been initialized which happens relatively late in the
boot/hardware initializing process.