We re having problem with the 9120 powerwere UPS...no backup when the utility (commercial power ) is not available...the UPS shut down, and all LEDs went off.

A Powerware 9120 2000 is an uninterruptible power supply (UPS) device that provides power backup to connected devices in case of power outages or other power issues. If the UPS is shutting down at 50% charge and showing low power alarm, there could be several possible causes:

1. The battery is failing: The UPS is designed to shut down when the battery charge reaches a certain level to prevent damage to the battery. If the battery is failing, it may not be holding a charge and may need to be replaced.
2. The battery is not compatible: Make sure that the battery you are using is compatible with the Powerware 9120 2000 UPS. Using an incompatible battery can cause the UPS to shut down or display error messages.
3. The battery cable is loose: Check the battery cable connections to ensure that they are tight and secure. A loose battery cable can cause the UPS to shut down or display error messages.
4. The UPS is overheating: Check the UPS for any signs of overheating, such as a hot feeling on the top of the unit or a burning smell. An overheating UPS can cause the UPS to shut down or display error messages.
5. The UPS firmware is outdated or corrupted: Check to ensure that the UPS firmware is up to date and not corrupted. Outdated or corrupted firmware can cause the UPS to shut down or display error messages.

If none of these solutions solve the problem, it's recommended to contact the manufacturer or a professional technician for further assistance. They will have the knowledge and expertise to troubleshoot and diagnose the issue with your Powerware 9120 2000 UPS.

hey dude your problem is so simple..below are my solutions.
if you already secured the fans for the replacement then its easy for you to do it, try to totally shut down your UPS removing the input and battery supply. avoid replacing the fans with power, its to dangerous. it consist of almost 400VDC inside in it.
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1. Four beeps every 30seconds (On Battery LED will be illuminated)
This alarm indicates that the Battery PowerSupplied outlets are now supplying battery power as opposed to power from theutility. If the UPS determines that the input utility power is unsafe for yourcomputer equipment, the UPS will switch to battery power.
Note: Ifthe power disturbance is brief, you may only hear one or two beeps.

2. Continuous Beeping (On Battery LED will beilluminated)
This alarm indicates that a Low Batterycondition has been reached and that the UPS will soon shutdown. Once the UPStransfers to On Battery operation, it can only stay on battery for a limitedamount of time. The UPS will sound this alarm about two minutes before thebatteries are totally exhausted. Once exhausted, the UPS will shutdown and turnoff its output power to your equipment. If you hear this tone you shouldimmediately shutdown your computer to prevent data loss or corruption.

3. Continuous Beeps for 30 seconds (BackUPS OFFICE 250 and 280 ONLY)
This alarm indicates the unit has detected anOverload condition after it has performed a self-test during start-up.

4. Continuous Two-Tone Beep
This alarm indicates a severe Overload wasdetected while the unit was on-battery operation. This tone will continue tosound until the unit shuts down.

5. Continuous Tone (On Battery LED will beflashing)
This alarm indicates that the battery-poweredoutlets are overloaded.

6. Continuous Tone (On Line and On BatteryLEDs flashing) Back UPS OFFICE 350,400, and 500 ONLY
This alarm indicates that an internal UPS faulthas occurred.

I would contact Eaton's hardware support forum in Europe. Here is the documentation link for the 9120 UPS:

First, we do need to full charge it. Then see what's being able to pick up a load of this Ups power or not? If not then it means something is wrong with this Ups. Please put this change.

A good electronics supplier should have. Get the correct voltage and size, and get one with the largest CFM available.

Power ware has a powerpass bypass switch for $200.00.

There is two inputs on this bypass switch. One for power, and one for the generator.

One ouput for your UPS. There you have it... There is your soluiton. I might add one other thing called a Power Guard, PMM117, to monitor the power of the backup generator. The time delay of this device will prevent over current from cooking your UPS power supply.

They also have a Hardwired version that is more expensive for you 5, 6 ,10KVA UPS. So a automatic bypass switch is what you need.

http://powerquality.eaton.com/Products-services/Backup-Power-UPS/EX.aspx?cx=34 u will get the required

mother board gone bad

Well all of the above mentioned parts are available in any electronics spare parts store. The capacitors are common which you can easily buy in any electronic store. Good luck!!