I see. We will need to first determine if the problem is with the remote or the IR sensor in the player itself.
IR or infrared light is normally not visible to the human eye. However IR signals can be visible through a digital camera viewfinder. You can use the viewfinder of a mobile digital camera, too. However some cameras seem to block IR range and IR may not be visible.
Problems with IR remote control or other IR interfaces like mobiles, laptops or printers with IR can be very difficult to diagnose.
If the IR interface is not working, you'll not find any light being emitted. You can check any button on the remote by pressing the button and watching it on the camera.