So while tidying up my power cables today I switch the power off at the wall and it starts the sustained beep... and this time it won't turn off!
I think maybe it got overloaded somehow (though I didn't change what has always been plugged into it), but anyway this noise is driving me crazy! I have it in another room and I still need earplugs.
Anyone have any ideas how to stop this thing?? I don't care about rescuing the UPS to keep using it, I'll throw it away if it comes to that!