question

[Red jive]

Do i plug a moniter into a mobo or a gpu 

[elpiop]

plug it into the gpu if you have one

[Red jive]

what is the problem with the motherboard

[Vash.]

Just now, elpiop said:

plug it into the gpu if you have one

Second.. If you plug into the Mobo you will be using onboard graphics chip which is < dedicated graphics card

[elpiop]

2 minutes ago, Red jive said:

what is the problem with the motherboard

There isn't a problem. But presumably you have the graphics card to either play games or do other demanding tasks. So if you plug it into the motherboard you won't be able to take advantage of the hardware that you have.