Computer won't turn on at all after failed OC

[Arismis]

Pretty sure it's the psu but wanted some other options to think through since psu is brand new.

Comp crashed while stress testing after OC.

When I press power button nothing happens. No fans, LEDs, anything.

Setup:
Asrock z77m
Core i5 3570k
2x8gb g skill ram
Corsair h50 cooler
650 w ocz zt series
256gb ssd - intel forgot model number
No video card at time of failure

System stable for quite a while under stress test. Vcore <1.4v temperature <68c all of a sudden crashes and now can't restart.

Any help is appreciated.

 

[bigcyco1]

CLEAR CMOS

 

[bigcyco1]

If your motherboard does not have a CLEAR CMOS jumper, you can often clear its CMOS settings by removing the CMOS battery and replacing it. The CMOS battery provides power used to save the BIOS settings – this is how your computer knows how much time has passed even when it’s been powered-off for a while – so removing the battery will remove the source of power and clear the settings.

Important Note: Not all motherboards have removable CMOS batteries. If the battery won’t come loose, don’t force it.