Constant beeping coming from one of the 2 Power Supplies on my server.

Posted on 2009-05-18
Last Modified: 2013-12-11
Hi All,

There is a constant beeping and a flashing light on the back of my server where one of the 2 power cords plug in.  The system event log shows the following:
Source: Server Administrator
Category: Instrumentation Service
Event ID: 1504
Type: Error

AC Power has been lost
Sensor location: AC Power Line 2
Chassis location: Main System Chassis

I had installed the most recent MS Critical Updates over the weekend.  Prior to this there was no beeping or sign of any problem. Not sure if this has anything to do with it or if just coincidental. The warranty of course is over for this Power Edge PE2500. The server is Windows 2000 SP4.

There is also the following in the system event log:

Source: Server Administrator
Category: Instrumentation Service
Event ID: 1306
Type: Warning
Redundancy lost
Redundancy unit: AC Failover Switch
Chassis location: Main System Chasis
Previous redundancy state was: Normal
Number of devices required for full redundancy: 2

Also the server is up and running and in Server Administrator all items have a green checkmark.
Question is this actually a power server problem, a sensor problem, or a driver problem and how to fix it.  Would like to know also if there is a way to silence the beeping.  

Thanks for all your help in advance.

Question by:jmattson30
  • 3
  • 3
  • 2
LVL 68

Expert Comment

ID: 24413442
It's a hardware error. Either the sensor (unlikely) or the power supply itself, or the power plug for it. The PowerEdge should have Power Supplies which can be removed live - do that with the beeper, reapply it, and look if that solves the beeping. If not, it is really malfunctioning, and should either replace it (Dell will allow for that if you in exchange of the defect one), or have it removed. The Redundancy error will stay in Eventlog as long as the failure is not resolved.


Author Comment

ID: 24413546
Hi Qlemo:

Is there a way to cancel the beeping until I can get if permanently fixed?  Where is the sensor located for this power supply?  I'm not very familiar with this hardware.  I don't think Dell will replace it since it is out of warranty and has reached it's end of service life with Dell.  Thanks for your help thus far!

Accepted Solution

Cameron_S earned 250 total points
ID: 24413636
I would check in the BIOS to see if there is a setting in regards to your PSU failure warning and see if you can turn off the alarm. I wouldn't open up a power supply to find the sensor unless you want to run the risk of electric shock - they are replaceable units for a reason. Your best bet is to search online for a replacement power supply from a third party vendor if Dell no longer carries the replacement unit themselves.
LVL 68

Assisted Solution

Qlemo earned 250 total points
ID: 24413731
Even after EOL, Dell holds spare parts, but will only give you in exchange to the defective one, and of course you have to pay for it.
WARNING! Don't hassle with hacking a Power Supply! It is a closed part, don't open it.

As I already said, the power supply should be removeable. Just pull it out of the chassis.
Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.


Author Comment

ID: 24413823
Hi Cameron,

I tried to boot into BIOS but it did not recognize my keyboard commands since it is a USB keyboard.  Apparently USB must not be enabled for DOS.  Is there any other way to cancel the beeping?  

Hi Qlemo,
If I pull out the defective power supply will the other one still keep it going until replaced?
LVL 68

Expert Comment

ID: 24413906
Yes, of course - that's what redundancy is for. I've done that several times in the past with a PowerEdge 2600.

Expert Comment

ID: 24414123
I always keep a spare PS2 keyboard just for this reason - you may want to do the same for cases such as this. You can try removing the power supply to see if the beeping stops - it may or may not. In all likelihood it will probably still continue to let you know that you are not running a redundant setup. As Qlemo said, that is what the redundant power supply is for, removing the defective unit should not impact the system in any way.

Author Comment

ID: 24414268
Thanks Cameron and Qlemo for your help and quick response.  I'll get it replaced and live with the beeping until replacement part comes in if the removal of the power supply will not silience the noise. Have a great day!

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

As you can read I recycle all my old hardware and the time has come that my power supply of 200 Watt cannot provide enough power for my backup server. I have lots of Compaq power supply's laying around, so I figured to use one of these PSU's. I t…
Usually shares are where we want them for our users and we tend to take them for granted. There are times, however, when those shares may disappear causing difficulty for your users. One of the first things to try is searching for files that shou…
Internet Business Fax to Email Made Easy - With eFax Corporate (, you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, fr…
With the power of JIRA, there's an unlimited number of ways you can customize it, use it and benefit from it. With that in mind, there's bound to be things that I wasn't able to cover in this course. With this summary we'll look at some places to go…

867 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now