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.
 
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