put a swrewdriver down the inside of the power button then prise it upward titt the button comes off you will then see a screw take this out and pull the switch assembuly up you can now replace your power cable
dave
April 2008
This should help http://www.dysonmedic.com./DC04%20Folder/DC04%20Cable.html
Ralph
April 2008
I can answer this question...
Problem with Dyson DC04 absolute power cord connection?