Blue light flashing on mobo?

[Wizz]

I had my friend build me a PC yesterday and i noticed that there is a blue light flashing above the power/reset/oc buttons on the motherboard. Everything works fine. What do you guys think?

http://www.newegg.com/Product/Product.aspx?Item=N82E16813130574

 

[voyagerfan99]

Hard drive activity light maybe?

 

[gates]

Sounds like HD activity light man. Wouldnt sweat it. on my board (see through panel) I get a yellow flashing light for my ssd activity =)