I have a reasonably large computer collection consisting of many many Macintosh systems and two Commodores. While very few of them are ever on at one time, I always leave them connected to mains power when off. Being all in my room, I do not have 20 power sockets on the walls for all the various adapters, routers, monitors and computers. As a result I have employed the use of 2-3 extension leads (with surge protection) to allow everything to remain plugged in for when I want to use it, be it my 512K or Apple II, to my Quicksilver or iMac G3. However, just recently in the last month or so, my house has been experiencing random power cuts with the trip switch needing to reset. The source is from my floor of the house, and my room is the only considerable suspect. I have left my room disconnected while I am away at college and when I do there seems to be no issue with the power cuts. Okay, but what i don't understand is: A) why this was never a problem for over a year before, B) why this is happening when all devices are off, and C) which device is the culprit! My iMac G3 being the latest addition is the first place I went, as I got it shortly before the power cuts started to happen. But when I disconnected it from the array, we still got cuts. Now I have theorised that it could be the voltage step down adapters that I use for my American 115V Macintosh 512Ke and Apple II Plus. They are technically on all the time, even if their respective devices are not. They do get hot and emit a high pitched tone when in use for a long time alright. Having to turn off all the networking devices (including my upstairs AirPort Express!) in my room every week is driving me mad. Any ideas guys?