unable to find audio interface attached to the first HD card

[saki]

Hi, I just installed my new system which consists of the following:

96 I/O
G5 Mac with OSX 10.4.8
Pro Tools HD 7.3.1
Core Card
Accel Card

I made sure that the cards are in the right slots (Core Card sits in slot 2 and the accel card sits in slot 3; they are connected correctly with the ribbon - this has been verified with DigiSetup: Both cards passed.).

The interface is connected to the Core card via the DigiLink cable from the interfaces PRIMARY PORT.

When I boot up Pro Tools I get the message: "Unable to find an Audio Interface attached to the first HD card. Please check power and digilink cables. Click OK to rescan"

I scanned the internet to see what solutions are out there and found nothing that was of any help: I deleted all the preferences related to Pro Tools and I made sure that the cards are in their correct slots. I did hear about something to do with a firmware update but couldn't find any details that would be of any use for me.

Can someone please enlighten me with what is going on here? Much appreciated.