I have an HP ML330. P# 600911-001. In that server I have two power supplies (P# 50854-001) for redundancy. Both work properly if I unplug either of the power supply cords separately. The computer continues to run, business as usual. If I pull out the power supply in the 2nd slot things still run. If I pull out the power supply from the first slot the computer powers down. I have tried switching power supplies and the same issue occurs when I pull the power supply from the 1st slot. My hypothesis is that there is something wrong with the first slot but I do not know where to start troubleshooting it past this point. Thanks in advance.

If the fan does not light up then it could be dead. You can verify with Server Administrator aka OMSA.

Your Model of Dell Poweredge 1800 server may not have a redundant power supply. The power supply is the most like cause of the problem. order a replacement power supply and replace the faulty unit.

OUTSIDE of a redundant PSU - The power supply is very inexpensive and can most likely be bought from any of your computer retailers, Amazon - Just make sure to confirm the right model type of power supply. BEST to have it tested before replacing it. To make sure that is the issue.. Many computer shops will test for free.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/william_02fc2766c1e13b73

Switch PSU between bays Use spare PSU
If server is still not working PSU backplane needs to be replaced. IS spare PSU sovles the issue, then it was a faulty PSU

Resetting the power supplies isn't necessary. Once one of the ptwo power supplies fails, the second power supply automatically takes over. Also, there isn't a need to power down the system to change the supplies as long as you change them one at a time.

if the system has no redundant power supply.
basically you will need to replace it with the same make and model from Dell or a working 2nd hand model.

Hi,
Does your server has single power supply or two power supplies.
Remove the power supply and reinstalled and check. Also you can install the power supply into second power supply bay and check the status of LEDs. Before you power on close all the server covers properly.

If above is not successfull remove the processors and reinstall properly and see if there is a difference.

You can download removal and replacement procedure by vising Support and Drivers in HP.com

http://h20000.www2.hp.com/bizsupport/CoreRedirect.jsp?targetPage=http%3A%2F%2Fh200002.www2.hp.com%2Fbc%2Fdocs%2Fsupport%2FUCR%2FSupportManua
l%2FTPM_179764-001_ch2%2FTPM_179764-001_ch2.pdf

Rather than try to explain it here, this link will take you too a great source of the technology.

http://www.poweroverethernet.com/

Redundant Power Supplies
One advanced feature available on high-end machines (especially servers) but also available to the general public for those willing to pay for it, is a redundant power supply. In essence, this is a power supply that actually includes two (or more) units within it, each of which is capable of powering the entire system by itself. If for some reason there is a failure in one of the units, the other one will seamlessly take over to prevent the loss of power to the PC. You can usually even replace the damaged unit without taking the machine down. This is called hot swapping, and is an essential productivity backup for use in servers and other machines used by a number of people.



Hope this helps.

The ProLiant DL380 G3 server requires that both primary and redundant fans exist in a specific configuration in order to perform optimally. Any deviation from the specified configuration will cause one of the above error messages to occur and the internal Health LED to illuminate. In a ProLiant DL380 G3 server without the redundant fan option, the server will shut down after the error message is displayed. In a server with the redundant fan option, the internal Health LED will illuminate and the appropriate error message regarding fan redundancy will be displayed. The purpose of this document is to detail the required configuration for both primary and redundant fans.
DETAILS Both primary and redundant fans in the ProLiant DL380 G3 server must be configured to meet specific requirements in order to avoid the error messages above and in some instances, subsequent shutdown of the server.
All primary fan locations (2, 4, 5, 6 and 7) must be populated with a fan before the redundant fan locations (1, 3, or 8) are populated. If a primary fan location is left unpopulated, the server will display one or more of the error messages shown above. In addition, the internal Health LED (the top LED on the front panel of the server) will display the status of the fans.
When the redundant fan option is used, all redundant fan locations must be populated. ProLiant servers do not support partial population of redundant fans. If any redundant fan location is populated without also populating all other redundant fan locations in the server, the fan system will not be fully redundant and one or more of the error messages above will be displayed.
Figure 1 below illustrates a ProLiant DL380 G3 server configured with all eight fans installed for fan redundancy. The server airflow is divided into three zones: processor, I/O and power supply. Shared fans 4 and 7 each provide airflow for two zones. If a shared fan fails, the failure is experienced in both zones.
Figure 1: ProLiant DL380 G3 server configured with all eight fans installed for fan redundancy
The internal Health LED (the top LED on the front panel of the server) indicates failed or missing components. The internal Health LED should be observed to determine the status of the fans as follows:
RED LED: A red LED indicates that the minimum fan requirements have not been met. Minimum fan requirements indicate that all primary fan slots must be populated with functioning fans.

• If the 1611 fan "x" is not present (where "x" is the fan location) error message is displayed at POST and the internal Health LED is red , then a primary fan is missing.
  
  
• If the 1611 fan "x" failure (where "x" is the fan location) error message is displayed at POST and the internal Health LED is red , then a primary fan has failed.

AMBER LED: An amber LED indicates that the minimum fan requirements have been met; however, requirements for redundant fan configuration have not been met. This means that all primary fan slots are populated with functioning fans, but at least one redundant fan has either failed or is missing.

• If the 1611 fan "x" is not present (where "x" is the fan location) error message is displayed at POST and the internal Health LED is amber , then a redundant fan is missing.
  
  
• If the 1611 fan "x" failure (where "x" is the fan location) error message is displayed at POST and the internal Health LED is amber , then a redundant fan has failed.
  

Note: In a redundant fan configuration, the error message fan system not fully redundant will also be displayed at POST if any redundant fan slot is left unpopulated or if a redundant fan has failed.