IBM 86607SU Hardware Maintenance Manual - Page 287

Netfinity 5500 - Type 8660 279 Table 14. Power Supply LED Errors AC Good LED DC Good LED Description Off Off No power to system or ac problem. On Off Standby mode or dc problem. On On Power is OK FRU/Action 1. Check ac power to system 2. Power Supply 3. Power Backplane 4. Power AC Inlet Box 1. Verify power supply switch is on. 2. Check processor connectors J10 and J17. 3. Move jumper J32 to pins 2-3 to bypass power control. If the DC Good LED comes on, reseat the system power switch (button) assembly cable connector to the system board. 4. Remove the adapters and disconnect the cables and power connectors to all internal and external devices. Power-on the system. If the DC Good LED comes on, replace the adapters and devices one at a time until you isolate the problem. 5. Power Supply 6. Power Backplane 7. System Board 8. Processor Board N/A