Overcloking failed

[gunsthebest]

I have a big problem.

My specs: i5 , mpower z77 , 16 gb ram and 2 gtx 770 running sli.

Yesterday I changed my graphic card settings trough msi afterburner.

Today I let the pc all day on and when I came back there was a black screen, tried to reboot, nothing I can even join the Bios. I ve tried to clear cmos but nothing maybe I do it wrong. 

 

Some ideas about how to fix ?

[Xreldo]

I would try taking out the graphics cards then trying to reboot. If that doesn't work maybe a screen problem?