URGENT PLEASE! How to stop constant whistle just started suddenly???

[Anonymous user]

2009 bought Back-UPS-ES 450/550G.

It just now all  of a sudden started this incredibly loud, maddening, nonstop whistle!!!  It's making me very sick!!!  In desperation I pressed the little button by the side of the light but it stopped my computer and I lost all the works I was working on!!!  PLEASE someone tell me ASAP how to stop it AND tell me WHY this happened? 

Thanks very much! 

P.S.  I hope I'll receive answers to my email as I don't see here where it says "Instant notification".....

[BillP]

hi adela

Without knowing the root case, the easiest way will be to remove the attached devices from the UPS, then turn it off and remove the UPS from AC power at the wall outlet (so unplug it). if it is still happening, then disconnect the UPS battery and it should cease.

it's hard to say without hearing the noise but maybe the beeper failed?

[Anonymous user]

Thank you Angela, by "removing the attached devices" do you mean the various plugs I have on the UPS?  Should I first shut off my computer and then follow the good instructions you gave me?  As to the noise, it's a loud, continued whistle. Not a beep.  Thanks again.   

[BillP · Accepted solution]

Hi again.

Yes, turn off your computer and anything else connected to the UPS. Then remove/unplug the plugs from the UPS outlets. Then follow those items I mentioned.

Yes, whistling is strange. Can't say I've heard that one before from this type of unit.