Just to confirm, to rule out all possibilities:
- you are using the OEM Samsung cable
- you are using a USB port wired directly to the motherboard of the PC, not a hub
- you have the phone in debugging mode
- you have rebooted both phone and PC while plugged in
- you can enter download mode, but no com ports show in Odin
One more thing, when attempting to connect with Odin are you pulling the battery out prior to plugging in?
If all you are wanting to do is unroot, you can try using ADB... You should still be able to use commands with ADB without mounting to the computer.
On a side note, didn't VZW's return policy change to 14 days before the iPhone release?
Still no luck after trying all of the above. At this point, I can't even get back to stock without root so I can return it.
Quick question about the usb drivers. After you downloaded the drivers, did you double click on the drivers file that was on your computer? If not you did not complete the install process for the drivers. When you download the Samsung drivers, you are just downloading the install package and you have to double click on that file to actually install the drivers.
su
mount -t rfs -o remount,rw /dev/block/stl9 /system
rm /sdcard/Superuser.apk
rm system/xbin/busybox
rm /system/xbin/su
rm /sdcard/su
rm /sdcard/busybox
mount -t rfs -o remount,ro /dev/block/stl9 /system
exit (first "exit" takes you out of su)
exit (second "exit" takes you out of the terminal)
reboot
are we sure its just not a defective cable?