DVD won't work

Clarifications

sounds like the DVD laser-lens has given up, you can try cleaning it or replacing the unit. You can also test it by trying to boot from a bootable DVD.

If you leave CD's or DVD's in the drive all off the time you are causing the lenses to wear out.

Optical Drive Cleaning

When you are cleaning a CD or DVD drive, there are two things that generally need to be cleaned - the tray and the lens. Cleaning the tray is simple - take some glass cleaner or isopropyl alcohol, apply it to a cloth, and rub the tray until it is clean. Leave it open for a moment until the tray has dried, and then you're done. To clean the actual lens, you will have to go out and purchase a CD drive cleaning kit for tray-based CD players (they have different ones for caddy and auto feed drives - if you have one of those you will need a cleaning kit specifically for that type). Follow the directions on the box to clean the drive. Generally this involves applying some fluid to the bogus CD (which conveniently has a brush on it) and allowing the drive to spin up (making this one of the few cleaning operations that needs to be done when the computer is on).

And a cool Tip from willcomp

https://www.techrepublic.com.com/5208-10879-0.html?forumID=101&threadID=302385&messageID=3020073

By mistake, is DVD Playing/burning software is rescently removed......