How to rollback after an overclock?

Oct 8, 2013
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So i just tried overclocking from 4 to 4.3 ghz and increased my voltage by 0.05.
Upon applying the change ive just got a blavk screen with A2 in the bottom right and if I hit del then "entering setup" appears but nothing happens.
How do i undo these changes? Didnt really ramp anything up enoigh ti break it, I hope.
 
Solution
Look for this on the motherboard:

maxresdefault.jpg


Remove for 30 seconds, replace, and boot. You can turn off the PSU with the switch in the back first, don't need to completely unplug it from the wall socket.