My Polaroid DVD Player says "No Disc"?

When I insert any DVD into my Polaroid DVD Player (PDV-0801A) it makes a whiring noise (sounds like it is spinning the DVD) and stops-it then makes another whiring noise and stops-then displays a "No Disc" message at the top left corner. I have tried multiple DVD's and verified the DVD's are operational in another non-portable DVD player. What can I do or where do I take it for repair? I am unable to locate my warranty information and have not had any success locating information online. I may have my receipt buy have not verified it for sure. I purchased the unit from Wal-mart in Dec 04 for $300.00. Please help!

Leigh in Frisco, TX