Can't increase CPU ratio

I have an i5 3570k and a biostar tz77xe3. I've entered the bios to try to overclock and I can select ratio in both turbo mode and normal CPU ratio and I can decrease both but nothing happens if I press "+". What is this? Is there just something wrong with my keyboard maybe?
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More about increase ratio
  1. I've heard of some BioStar botherboards where you have to type in the ratio you want. Is that board able to overclock?
  2. Hey, thanks for the answer but i figured it out soon after. The + button does not increase the number but the spacebar does. Thank you though, and I'm not sure if it's the keyboard or the motherboard.
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