I just got a new DVD burner, and it was working fine for a few weeks. Then today, i reboot my computer, and it's not there. i reboot gain, and it shows up on the BIOS splash screen correctly, but windows can't find it. i checked my device manager, and it says the drivers are installed, but the device is not present. About a week before i bought the new burner, my old drive stopped working, but the circumstances were different. it was recognized, but it wouldn't read anything, and a system scan (using Sis Sandra Lite) showed something was there, but it couldn't tell me what. Are these two tings related, and how can i get my drive working again?