I have an old Belkin F6C650-USB-MAC UPS which I used without problem to support some Macs and PCs for a number of years (probably bought circa 2002). I then moved to a house where it wouldn't work because the 3-pin sockets weren't grounded (ouch!), so it was out of use for about 18 months. When I tried to use it in this house, it would not respond at all.
Is there anything sensible to do other than recycle the old one and buy a replacement?
(It's a 120V, 12A unit.)