Well in that case it's in the BIOS where a Temp Sensor or Voltage line is enabled and the sent data is way out of Spec and causing the Alarm to go off.
The Power Edge should have a Monitoring Program installed that will tell you what is happening when the OS is running. That will tell you if you have an overheating problem or a Bad Power Supply which has a low/high Voltage Rail.
Either way you need to shut it down and do some fault finding before you totally fry the thing. At the very least make sure that you have [b]Up to Date[/b] Backups of that server but I would be guessing that it's either a High Temp, Fan Fail or Low Voltage Alarm.
Col