I've heard a few people mention about testing their PC with a power meter to find out how many Watts the PC is using... I've heard of these power meters that you plug in between the socket and the appliance on TV shows, and most recently on the BBC Breakfast show, they said that B&Q sell them for £9.99, but I went to 2 B&Qs local to me, and I couldn't find it: When I asked about it, they didn't even know what I was talking about! I know maplin sell 1, but it's a stupid price at £25!