Originally Posted by marshallh
gotta cut them all, and tie them all together.
multiplying by 2 or 4 will not work because the multimeter has a higher resistance than the piece of wire that is completing the second path - that is, more current will flow throught he second or third or fourth wire than the multimeter
either cut them all and measure or just tell us what you have
alternatively you could measure current going into the PSU itself.
strangely enough, my computer under no load only draws about 20 watts, and it's a P4 1.8ghz