Shoutbox

Also, note that even though you may have everything turned on it will not always be drawing the rated current. For example, your speakers will be drawing the maximum current when the volume on them is maxed out only. Even then I can't understand how they claim to draw so much current besides the PC, Monitor, TV and Speakers the rest seemingly should draw a minimum current; my Altec Lansings draw a maximum current of 2A. So I don't understand how they can draw so much. And if indeed they are you should be able to feel it by touching the lead going to the main as it should heat up quite substantially.

On that note your second power board forms a loop in the picture. This is a major no-no, when wire is looped like that it forms an induction coil which might be causing your strange problems.

Just thought it through a bit more thoroughly:
It probably has to do with the power in the UK being 110V (AUS being 240V) but that still doesn't fit into my rudimentary High School physics formula V=IR, if resistance is constant then halving Voltage should halve Current. Somebody with better physics knowledge might be able to explain.