Some of this thread is abit funny.
Its not obvious that the supply would die at all. Certinaly if it lasted 5 minutes then he didn't do anything wrong. Theres nothing in the BIOS of the laptop, in fact its nothing to do with the laptop at all, all of the laptops are the same in regards to power consumptions in all countries, its just the adapters that change.
I imported a 700m into the UK (as its cool and the only laptop Dell don't sell here) and the supply it came with was identical to a UK one, just with a US lead at the end. Pulled it off and put on a UK one and all is fine.
Its just a fault with the adapter I expect. I have experiemented with flicking that voltage switch on an old computer and it doesn't last 5 minutes, doesn't last 5ms
UK is 230V BTW.