I'm having an issue with a Latitude E6410 not recognizing the DVD Drive with in the BIOS. If I re-seat drive it will eventually show up. The system board was recently recently replaced for the same reason. I have tested known good DVD/RW drives within the system and they will appear for awhile, but reboot the system and the drive will disappear from the BIOS. The latest BIOS has been installed onto the system. Any ideas?