My sons pulled the power cables from the front of

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Hi,
go to this url
http://global.dficlub.com/Support/Download/download_us.jsp?SITE=US
in the --Model-- drop down box scroll to the KM400-MLV board, I checked and there are two different models KM400-MLV and rev. B
Select the one you have and hit go. In the product result table click on the product, you will come to the features page and on the left side you will find the corresponding manual.

I hope this solves your problem.

Check in corenr of motherbord.

Read carefully on motherbord you find
HDD LED
PWR LED
PWR ON /OFF
and other pin .
Then fix Read on wire then fixed it in position.
Let me know if you need more assitanse.

cehck this image.
http://www.cs.toronto.edu/~dwf/notes/correct_pinouts.png

There are two plugs with anumber of cables each. Generally the black cables are on the inside.