PRESTO GIGABIT PRO Ethernet Card not detected in Mac OS 10.5.8

Hello,
I am an IT Technician who is troubleshooting an issue with the network card on a PowerMac G5 tower. I have installed the PRESTO GIGABIT PRO Ethernet card (which states that it is compatible with Power Mac G5 (with PCI or PCI-x slots). After I install it, and plug an ethernet cable into the ethernet port on the card, it appears as if it is getting network activity since the LED lights begin to blink on the card. However, when I boot the G5 with Leopard 10.5.8, it does not see the network card in the system profiler under PCI cards. The only PCI card detected is a Broadcom 5702 in PCI slot 3. I have tried seating the card in different PCI slots but I still get the same result. Do you all have any ideas what may be causing this issue and a possible remedy for it? Thanks for any assistance that you can provide.

Hi Bruce, and a warm welcome to the forums!
I can't find the PCI card, just the PCIe card...
http://www.sonnettech.com/support/kb/kb.php?cat=164&expand=a3_a2b405&action=b490#b490
http://www.amazon.com/Presto-Gigabit-Ethernet-PCIe-Card/dp/B0017K6BR8
But on a hunch, System Preferences>Network, unlock the Lock if need be, see if you get New Port Detected, or click the little + icon and see if you can add Ethernet.
If it works & that is the Interface used for Internet, click on the little Gear icon>Set Service Order, drag Ethernet to the top.

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