Pc turned off and wont start up again.

Help
Ive ben using my pc for about a year with not to many problems.
But I was using my computer yesterday and it just turned off and wont power up any more. I press the on button and nothing happens at all, no fans, not cd drive no nothing.
My first thoughts are maybe its mobo or psu related. From looking at the back of my computer i can see that my LAN lights are powered (altough my router says its not, wich it usualy does when it is off) .
And if i unplug my pc at the mains and plug it back in then my webcam (which is usb powered) makes it's 'i have power' noise and my ram (which has status lights) power up for a few seconds).
My spec is:
Msi 875p NEO FIS2R
intel Pentium 4 3ghz
1024 (2*512 mb) Crucial xms)
enermax 550w psu
thermal take xaser iii case
160 maxtor Sata HDD
Can any one help? cheers

Ok, I've tested the switch, thats fine.
Then i took mobo and psu out of case and tested it with just ram and cpu. This resulted in nothing, the fans would like rotate 2cm.
I reset the bios/CMOS. but this didn't appera to do anything.
I reseated the components that were in there (CPU and RAM) but this sisn't change anything.
Then I removed everything so it was literally psu and motherboard. and just tested them on their own. Still would not power up. The fans would spin for about a second and then i could smell a bad smell, but i could not identify it.
I guess this narrows it down the motherboard or psu now. What do you think? and ideas?

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