Hi mark, my tv630 has been doing the same for the last 2 weeks, it works if you bang the machine where the noise is coming from at the same time as you press the button. i came accross this site by chance tonight and see that you have had a reply. you can buy one of those pcb boards from http://www.4hoover.co.uk/cgi-bin/product.pl?PID=723532&query=Hoover%20TV630%20001&model=TV630%20001&path=52665,52670 they are £14.99. i am going to buy one. was going to fork out 200 on a new machine, so its worth a try.
warren
October 2007