Fan causes System to shutoff abruptly

I recently purchased a case, Axio 732SL (x5 series), with a 480W power supply. I have the following connected, by way of the pigtails:

Pigtail 1: CD-ROM > CD-RW > Case Light

Pigtail 2: HDD (120gb@7,200rpm) > HDD (4gb@5,400rpm) > Secondary (case mounted) exhaust fan, 12V@1.84A > Access Panel Fan, 12V@1.84A

Pigtail 3: Unused, not usable plug; 6-prong, 6 direction slots.

Pigtail 4: Unused, not usable plug; 4-prong, in a square configuration.