Acomdata on-da-go, will not show up on my computer (Conceptronic Ondago SHD120UFAPE-54 Hard Drive)

[qanda]This question is published in the hardware section for the AcomData Ondago hard drive - 120 GB - FireWire / Hi-Speed USB. Click here to view full specs.[/qanda]I have a pc XP, I rebooted computer and would not boot with hard drive attached. Had no choice but remove and reboot. Now it will not show up anywhere. Any ideas? It is new and I was starting the backup process. Of course the owners manual says never disconnect without dismounting.Â