Short circuit protection?

Oh I thought it might prevent what happened to me before, my computer wasnt even switched on and it short circuited and the psu-blew.

God knows why the fuse in the plug didnt blow instead of the psu.
 
The mobo wasnt screwed in properly (crappy screwless case) and it moved a bit and shorted on the case, at least thats what I assume was the cause.
 
Other than a short circuit I dont see what it could have been, after all the pc was switched off, unless something was loose in the psu?
 
I had a surge protector and nothing else connected to it blew. The psu was on at the switch at the back but the pc was off.
 
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