Power switch doesn't work on Dyson DC04 Absolute+. ?

Two days ago, the power on our Dyson DC04 Absolute+ kept cutting out, and then this morning when I switched it on, there was a single soft 'click' noise and then it died completely - the on/off button has no function now whatsoever. I have absolutely no technical/DIY/repair skills. Can it be fixed or should I just dump it?