hotpoint dwm55 blowing fuse/tripping switch as soon as turn on?

Hi I have a hotpoint dwm55 and as soon as I turn the dishwasher on it either blows the fuse in the plug and/or trips the fuse board and turns the downstairs sockets off. I have checked for leaks and had the front/back and bottom side panel off, and no signs. I understand that it may be shorting? The waste/pumps etc are not blocked? Any help would be much appreciated