The light flashes it opens and closes and reads somethings more cd than dvd but something is wrong. It happen around the time I tried to install memory from wish.com or the windows media codec pack and adding parts to my computer. It also can be when I tried to install a Sitecom WIFI router. It is a Dell OptiPlex 755 SFF With Windows 10 Home and Linux Mint dual booted. 8 GB of Ram 160 GB HHD and 1 GB graphics card.