my memory not working

[Pers__]

Hello everyone.
My computer does not recognize one of my memories.it was working properly till I once removed it and now when I install it back it's not recognized.

And idea what to do?
Main board:giga-h61-s2p

 

[Seanie280672]

Try it on its own, see if it works without the other stick, if it still doesn't work them rma them, why did you remove it?

 

[Nima_3]

Try it on its own, see if it works without the other stick, if it still doesn't work them rma them, why did you remove it?

My pc wasn't working well then I thought the problem was from memories.but it was from my graphic card.