Here is a list of things to do if your computer is unable to read a blank CD or DVD:

1. Check if your disc is blank.
2. Ensure you are using the corrent type of disc for the type of file you are trying to burn.
3. Check that your disc is inserted properly.
4. Ensure that the disc is not scratched, warped or covered in fingerprints.
5. Check your drivers and update them if necessary.
6. Check if the disc is compatible with your CD/DVD drive.
7. Make sure you have the correct type of disc drive installed.
8. Try burning the disc on another computer.