Hi,
Please answer the following questions to help us understand the issue better.
1. What happens when you try to run a CD/DVD on the LG device? Do you get any error message?
2. Is the issue specific to any particular CD/DVD?
3. What is the make and model of the computer?
I would suggest you to run the hardware and devices troubleshooter and check for the reason behind the issue.
Follow these steps to run Hardware and Devices troubleshooter.
a. Press Windows key + W and type troubleshooting.
b. Select Troubleshooting.
c. Select View all on the top left corner.
d. Run Hardware and Devices troubleshooter.
I would suggest you to update the chipset drivers from manufacturer’s website.
Than install the firmware update released by LG and check. Here is the link for your reference.
http://www.lg.com/in/support-product/lg-GP50NB40
Let us know about the results of the steps provided above. We would be happy to help you further.