The system will simply hang and the drive light will begin flashing. Opening the cd-rom drive tray will allow the system to unhang and continue the rest of the boot process. There is nothing in the CD-Rom drive. Thanks for your help
Reseat the CDROM cables, and boot to the Dell Diagnostics disk. If the same thing happens (the system will not boot to the Dell Diagnostics disk unless the CDROM drive door is open), contact Dell Technical Support. You need to have your drive replaced.