I'll just stick in my 2c here. I have a 240V mac plus that behaved exactly this way when I first got it. It would boot up and after a short time would trip the residual current device at the fuse box. A quick peek inside revealed the likely culprit, X and Y rated caps in the mains filter were all cracked open. After I recapped the entire board this problem went away but I'm about 95% certain that the RCD trip was caused by these.

I replaced them with these which fit perfectly -

http://uk.farnell.com/jsp/search/productdetail.jsp?CMP=i-ddd7-00001003&sku=1006064

and this -

http://uk.mouser.com/ProductDetail/WIMA/MPX21W3470FK00MYSD/?qs=%2fha2pyFaduj0ApMVe66xmIlWTZwkT1%252btsdp6MlIXDNJF3KG5WmKzuXlIXCj2njBP

This one was a shade bigger than the original due it's rounded case and I had to temporarily remove the transformer to fit it, the pin spacing was not quite perfect either. Otherwise these parts were an exact match for what came out of the european power board in positions C33, C36 and C37.