Advent 7060 refusing to power up?

Hiya, I have an Advent 7060 which intermitently (more often than not at the moment) doesn't seem to be getting power.

When it happens the orange (power) indictor usually flashes (or goes off), although the rest of the lights are on. If I jiggle the power cord about it sometimes fixes the problem, although it then fails again a little later.

Any suggestions for what is wrong?