Computer Shut Off No Reason? [New PSU]

Hey I sucessfully installed my corsair CX600 PSU into my HP envy, everything was working fine and dandy and then all of a sudden it shut off and won't turn back on, yes all the cables are plugged in

 

Any ideas of what might have happened and how I can fix it?

Any other people who may know what this is, btw Garry, was it very annoying or was it too rare for it to bother you

help

You really shouldn't double post. There's an edit button.

Also, Try putting your old PSU in. See if it works. If it does, and your new one still does not, its probably gone.

You were also asking about your CPU 4 pin earlier, did you get that straightened out? Or did you blow something up?