40Concurrent RPS and AC inputs• Symptom 1The system status LED is off.• SolutionTo resolve the problem:a. Verify that the AC power cord is securely connected to the switch, and the AC-input powerreceptacle on the switch and the connected AC power outlet are in good condition.b. Verify that the external AC power system is operating correctly.c. Verify that the switch is securely connected to the RPS.d. Verify that the RPS is operating correctly.e. Verify that the operating temperature of the switch is in an acceptable range, and the powermodule has good ventilation. Over-temperature can cause the power module to stopworking and enter protection state.f. If the problem persists, contact H3C Support.• Symptom 2The system status LED is on but the RPS status LED is steady yellow.• SolutionTo resolve the problem:a. Verify that the AC power cord is securely connected to the switch, and the AC-input powerreceptacle on the switch and the connected AC power outlet are in good condition.b. Verify that the external AC power system is operating correctly.c. If the problem persists, contact H3C Support.• Symptom 3The system status LED is on but the RPS status LED is off.• SolutionTo resolve the problem:a. Verify that the switch is securely connected to the RPS.b. Verify that the RPS is operating correctly.c. If the problem persists, contact H3C Support.Hot swappable power module failureThis section applies to the S5150X-16S-EI and S5150-24S-PWR-EI switches.For the S5150X-16S-EI, examine the PWR1 or PWR2 LED of the switch to identify power modulefailure.For the S5150-24S-PWR-EI, examine the PWR1 or PWR2 LED of the switch and the LEDs on thepower module to identify power module failure.• For more information about the PWR1 and PWR2 LEDs on the front panel of the switch,see Table 22.• For more information about the LEDs on a power module, see H3C PSR360-56A PowerModule User Manual, H3C PSR720-56A Power Module User Manual, and H3C PSR1110-56APower Module User Manual.Power module failure• SymptomThe power module status LEDs are not steady green.