My Dell 8300 showed blue screen "UNMOUNTABLE_DRIVE" so I CD booted into recovery and ran "chkdsk", booted back up from hard drive ok. After a couple of hours, PC froze up. Now, when I turn on power, the CD drive lights are flashing and I'm hearing a clicking noise back and forth between the two of them, but nothing happening beyond that. I can't get the drive door to open to try the CD again. Any ides would be GREATLY appreciated! Thanks!