DVD players occasionally go on the fritz just like any other piece of machinery we use in our daily lives. There can be a number of different problems that could go wrong, but most of them have pretty simple solutions that can be done relatively quickly and with little monetary investment.
Start basic and simply make sure the device is plugged in properly to the power outlet. You want to check for shorts in the power supply cord as well by jiggling the cord around and seeing if the device turns on and off.
Check the connections the DVD player has to the television set to make sure it is hooked up properly and that all connections are still functioning. Sometimes connections can come a bit loose and this can cause you to have problems as well. Tighten up the connections and see if the player begins working correctly.
Unscrew the DVD player housing and remove it from the device. Lift the clamp so that the DVD player lens is exposed for you to clean.
Take your canned air and spray away any dust off of the lens and any other part of the inside of the DVD player to remove excessive dust and build up. If a build up of dust gets on the lens, it will be unable to read the DVD discs you insert into your DVD player. It is good to routinely give your DVD player a good cleaning even when working properly to avoid build up.
Replace the DVD player housing and secure it back in place using the screwdriver. Turn on your DVD player and test your repairs. If the DVD player is still not working correctly, you may want to remove the DVD and give it a good cleaning as well with your canned air and wiping it with a soft cloth.