DVD player wont read disc... Suggestions??

I have a little generic brand "inititial", i believe compact disc player that simply wont read the disc, i have put several different types of formatted new and old Dvd ,etc. and it just simply does'nt read. Do you have any suggestions Do i nead a new light-bulb, to clean the head or some type of maintenance that will help this little dvd player read? when i insert DVD and close contraption it goes into loading... mode than reads "no disc...". If you have any suggestions that would be great, i would hate to trash this device it be fairly new...