Make sure you look at the Samsung P241 Troubleshooting Guide first to see if you can solve your problem without taking the DVD player apart.
With the back of the DVD player facing you, remove the three 1 cm black screws on the right, left, and top sides using a Phillips #1 screwdriver.
Pull the top cover towards you until you can lift it up and off.
With the front of the DVD player facing you, turn the power on and eject the disc tray.
Press down on the disc tray with your thumbs while also pressing up with your pointer finger on the left and right edges of the silver cover. The cover should easily pop up and off the disc tray.
To remove the front panel, lift up the clips on the bottom, left and right sides of the DVD player.
Gently remove the front panel by pulling it forward.
Press the eject button again to make the disc tray slide back into place.