|Have you, or is it possible anyone else who has had physical access to this laptop|
- dropped it, or subjected it to a physical jolt ?
- spilled liquid on it, or exposed it to liquid such as rain, or sprayed it with liquid ?
Has there been a power failure event, or lightning strikes in your area, when the AC adapter was plugged in since the DVD drive was last detected / worked properly ?
Does the DVD drive show up as being detected in the computer's bios Setup ?
Click on Computer, select System Properties from the top bars, click on Device Manager on the left on the resulting page.
Is there a yellow ! (exclamation mark) or a red X beside the entry for your DVD drive ?
Do you have more than one third party (did not come with Windows) burning program installed ?