Apple powermac g3 blue.white Service Manual

 

 Troubleshooting

General/Logic Board LEDs - 10

 

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 sec)
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.

 

DS6 indicates Ultra ATA bus activity.