Assuming you've tried it in a known-good wall-socket and checked the fuse in the plug then your assertion,
"all the electricals are ok"
is incorrect. If they were all OK then the machine would work.
You need to check with care just where the power is getting to in the machine. To do this you will need a meter with leads or at the very least a mains tester screwdriver (about 50p).
Nice DC01 pictures here...
http://www.dysonmedic.com/DC01%20Folder/DC01%20Cable%20change.html
Good luck...
Peccavi
January 2009