How can I fix my Mikomi cd player?

My Mikomi cd-8422 player will not play cds anymore. When I turn it on the Mp3 word flashes instead of the cd word (which used to flash). It says that there is "no disc" when there is a disc in the player and then turns itself off. I presume that the cd player is on the Mp3 setting but I press many buttons to change it back but It doesn't change it. It then turns itself off. How do I make it go back onto the cd function?