I was in our computer room (not touching anything) when the servers connected to the UPS turned off and the UPS started giving out the constant beep, which I thought meant it was powering everything connected to it. However there is no power coming from it and all the lights are off. I tried switching it on by holding in the Test/start button but this only resulted in all the lights appearing briefly and a beep.
I have checked the cables and they seem fine - any other ideas?