• Unit identifier blue/white LED
• A green BMC heartbeat LED
If the system motherboard is powered on and there is no LED activity showing on the unit, it must be
replaced. Figure 19: System motherboard status LED locations and functions on page 52 shows
the locations of the motherboard LEDs.
1. 12V overcurrent
2. Unit ID
3. BMC heartbeat
4. Top to bottom: Sleep A state, Platform Reset, Power Good HARP 0, Power Good HARP 1
5. Top to bottom: Power Good P12V Aux, Power Good P12V E, Power Supply Power OK, System Power OK
6. Top to bottom: Power Good P3V3 Aux, Power Good P3V3, Power Good P5V Aux, Power Good P5V
7. Top to bottom: Power Good CPU 0, Power Good CPU 1, Power Good CPU 2, Power Good CPU 3
8. Top to bottom: Power Good P12V A, Power Good P12V B, Power Good P12V C, Power Good P12V D
Figure 19: System motherboard status LED locations and functions
52 Integrity MC990 X system Troubleshooting
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