If you don't think the MMC drive reader is the source of the problem then don't tell Dell. If you are inside the 1 year home service you might want to take the drive out before the service rep gets there.
Remember, even after you took the drive out it still didn;t work. So maybe it's a coincidence.
Dell Dimension XPS-T500 ---> PIII 1 Ghz 0TA6L Windows Dual Boot Me/2000 Pro. (Almost) 256MB ECC Ram Bios: A10 Promise ATA/100 Card 45 GB 7200 Maxtor ATA/100 40 GB 7200 Maxtor ATA/100 Zip 250 internal Sony CD-RW CRX140E Toshiba DVD SD-M1212 Cinemaster DVD decoder card Turtle Beach Montego II Sound Nvidia 550 Viper 3com 3C905B-TX NIC 3com USB ext. 56K voice Faxmodem Pro 3com Cable modem Belkin 7 port USB hub Sony CPD-200GS 17" monitor HP 895Cxi Printer Visioneer One Touch Scanner