LG GSA-H55N does not detect/read DVD Movies

[qanda]This question is published in the hardware section for the LG GSA-H55N. Click here to view full specs.[/qanda]My LG GSA-H55N DVD writer will not detect, read, or play DVD movies. DVD movies are not detected and will not open/play in My Computer, Power DVD, VLC, or Windows Media Player. However, it will run and install video games and software from both CDs and DVDs. It will burn data CDs. I believe it is on firmware 1.03. Please help! Is there anything I can do, or is my hardware defective?