Computer won't start at all!

I was playing with my sata cables after I shutdown the computer and now it wont start, no fans turning, no harddrive sounds, nothing. A couple of months ago I got a warning message saying that my nvidia graphics card is receiving insufficient power, I restarted, checked the PSU values and everything seemed ok. Now I checked all the cables inside, on/off switches and even changed the power cable. What could the problem be? I'd hate for it to be the mobo

Thanx
 
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