I have bought 3 reconditioned computers from Amazon, A Dell Optiplex 9020, an HP Z420, and another Dell Optiplex 9020.  The first 2 are working properly, I am using them every day, and I am satisfied with them.  The most recent Optiplex will not read or write a DVD.  I had installed various programs on it and everything seemed fine until I tried to burn a DVD.  It opened the tray with the DVD blank on it and said to insert a disk.  I tried a different blank disk with the same result.  I later successfully burned data onto those disks with another computer.  This latest Optiplex will play a music CD, but when I try to play a commercial DVD, it opens the tray with the DVD on it and tells me to insert a disk.  The 'This PC' window of each of the Optiplexes identifies its optical drive as 'DVD RW Drive (D:)' .  I am not sure whether it is worth the trouble of trying to return it (the packaging has already been recyled, I am unsure how I should proceed).  For now, I see the failure rate of Amazon reconditioned computers to work properly as 1 in 3.  If I can find time, I'll try swapping in a drive from an old computer stored in the garage.