Why can my Dell Inspiron 1545 read CDs but not DVDs on BOSS 10?

First, separate disc detection from movie playback. Try a couple of known-good DVDs, including a data DVD if you have one, and check whether the system sees the disc at all. CDs working doesn't rule out a problem with the drive's DVD reading hardware.

If no DVD is detected, check the system logs after inserting one for drive or read errors. A dirty, damaged, or incompatible disc is possible too, so testing more than one helps narrow it down.

For DVD movies in VLC, check the available Debian-style packages for libdvd-pkg, libdvdnav4, libdvdread and vlc-plugin-access-extra. Encrypted commercial DVDs may need additional decryption support, and libdvd-pkg may require a separate configuration step after installation.

Package names and availability can vary with the distribution and release. If libdvdread8t64 isn't available, search for libdvdread instead of assuming that exact version is required. Playback packages won't fix a disc the drive cannot read at all.