Help fan test

[Sunny Squash]

I want to see if all the fans work in my rig can I plug the power to the mobo and attach the on button from the case to the mobo and press the power on button on my case ? oh the and the mobo isn't in the case

 

[Sunny Squash]

I heard about this but can I still do it through the mobo?

 

[Sunny Squash]

thanks