Computer turns on for a second then off

I recently built my first computer and I decided to overclock it, I went in probably not as wise as I should be and I changed my bclk from 100 to 120 my computer instantly froze and now when I go to start up it turns on for a second all fans running and led lights on but no system sound before it turns off and then 2 seconds later it repeats doing it indef, is there a way to fix this or do something to reset my mobo settings?

Specs: i5 sandy 2500k, 600w cm extreme, corsair CPU fan with artic silver 5, video card and all other fans unplugged now and still doing it
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More about computer turns
  1. Reset your cmos/bios(button or jumper on the board)
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