Mobo & Keyboard issue

[Akamii]

So i built a new PC yesterday, but there was a problem which is the keyboard. Sometimes it types wrong keys instead of the actual keys i do press, for example sometimes if i press "k" or any letter, it types "dsad3441sa0" instead or any weird letters.
also if i hold any key such as "w" it should be "wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww...." until i lift my finger, but actually this keyboard stops typing the letter by itself until i lift my finger and hold the key again.
and also it sometimes causes a shut down to my PC like if i went to the start menu and chose to shut down the PC.

and keep in mind that i tried many keyboards "USB keyboards" and all of them have the same problem, but if i connected any of these keyboards to any another PC it will work fine.
i thought its a problem with my USB ports, so i used PS/2 keybaord and the problem was gone by 50%, but still occurs. So i thought its a windows problem, then i went to bios to test the keybaord so i can see if its windows related or mobo related, and actually i got the same problem in bios while moving arrows..

SO guys do you think its a mobo problem and i should RMA it or its OS problem? or whats going on?

[Akamii]

UP

[runit3]

What Motherboard?

 

Are these USB 3.0 keyboards, 2.0, or PS/2 (or all types with PS/2 converters on the USB ones)?

 

Did you install the chipset drivers?

 

Did you install the USB 3.0/3.1 drivers (if they exist)?

 

What OS?