Dell PowerEdge M420 Hardware Owner's Manual - Page 294

3 Reseat the CMC module and see if the CMC module fault indicator turns off. See "CMC Module" on page 271 and Figure 1-19 for more information about the module's indicators. 4 If another CMC module is available, swap the two modules. 5 If the fault indicator is off, but the serial device connected to the serial port is not properly operating, go to step 6. If the fault indicator is off, but the network management device connected to the network interface connector port is not properly operating, go to step 9. NOTE: In an enclosure with two CMCs, serial connections are only supported on the Primary CMC. This is designated by the single blue LED. See Figure 1-19. 6 Reseat the serial cable to the serial connector on the CMC module and to the serial device communicating with it. 7 Connect a known-working null-modem serial cable between the CMC module and the serial device. 8 Connect a known-working serial device to the CMC module. If the serial device and CMC module still do not communicate with each other, see "Getting Help" on page 337. 9 Reseat the network cable to the network connector on the CMC module and to the network device. 10 Connect a known-working network cable between the CMC module and the network device. NOTE: If the CMC is connected to another CMC in an adjacent enclosure and there is no failover, check the network cable connected to port Gb2. If there is no external management connection to the CMC, check the cable connected to port Gb1. See Figure 1-19. 11 Connect a known-working network device to the CMC module. If the network device and CMC module still do not communicate with each other, see "Getting Help" on page 337. 294 Troubleshooting Your System