Cant get my PC to see SATA drive on Promise controller card

I have an unRaid system (www.lime-technology.com) which i built myself a while back.

I have an ASUS P5PE-VM LGA 775 Intel 865G Micro ATX Intel Motherboard and a PROMISE SATA300 TX4 PCI SATA II (3.0Gb/s) Controller Card.

I have a sata hard drive on each of the six SATA ports on the motherboard and one drive connected to port 2 on the promise controller card.

I want to add another SATA drive and for some reason when i connect it to any of the ports on the promise controller card I cant get the system to see it.

unraid servers use their own version of linux (unraid OS) so i don't think there is any utility i can install to manage the devices on the promise card.

I am wondering if there is anything I need to modify in my system bios to get it to work or if there is some kind of hotkey to enter the promise bios.

any suggestions?