Table 83. NIC indicator codes (continued)NIC indicator codes ConditionLink indicator is blinking green, and activity is off. Indicates that the NIC identity is enabled through the NICconfiguration utility.Power supply unit indicator codesAC and DC power supply units (PSUs) have an illuminated translucent handle that serves as an indicator. The indicator shows ifpower is present or if a power fault has occurred.Figure 192. AC PSU status indicator1. AC PSU handle2. Socket3. Release latchTable 84. AC PSU status indicator codesPower indicator codes ConditionGreen Indicates that a valid power source is connected to the PSUand the PSU is operational.Blinking amber Indicates an issue with the PSU.Not powered on Indicates that the power is not connected to the PSU.Blinking green Indicates that the firmware of the PSU is being updated.CAUTION: Do not disconnect the power cord orunplug the PSU when updating firmware. If firmwareupdate is interrupted, the PSUs will not function.Blinking green and powers off When hot-plugging a PSU, it blinks green five times at a rateof 4 Hz and powers off. This indicates a PSU mismatch due toefficiency, feature set, health status, or supported voltage.CAUTION: If two PSUs are installed, both the PSUsmust have the same type of label; for example,Extended Power Performance (EPP) label. MixingPSUs from previous generations of PowerEdgeservers is not supported, even if the PSUs have thesame power rating. This results in a PSU mismatchcondition or failure to power on the system.CAUTION: If two PSUs are used, they must be ofthe same type and have the same maximum outputpower.CAUTION: When correcting a PSU mismatch, replacethe PSU with the blinking indicator. Swapping thePSU to make a matched pair can result in an error214 System diagnostics and indicator codes