You may have solved your switching problem by now so sorry if this is late.
If your machine has a UK type plug,irrespective of your location, then the plug itself has a replaceable fuse.
Constant surges caused by you bypassing the on/off switch stress this fuse over time and it may have blown.
To check, unscrew the screw near the earth (ground) pin and replace the fuse with one of the same rating as your mains supply limit allows (eg. the original fuse rating for UK is 13 Amp but it should not exceed 10 Amp for Australia)
Bill, August 2007