There seems to be two fuses in the fuse block - one for the dash socket ("cigarette lighter" - 15A fuse) and a 10A fuse shared for the other two power sockets. I don't know exactly where this fuse is in the fuse box, so you'll need to try to track it down yourself. I'll look tomorrow in my fuse box though.
There is also a power socket relay behind the coin drawer. If the fuse looks fine, replace this relay temporarily with another relay of the same color and see if the power sockets work (or the other item now fails to work). Generally, you can find another relay at a junkyard for cheap if yours turns out bad.
