When I install the ISI4608 PCI card in the COMMPLETE 4000 server, I get a 'DISABLED' message in the STATUS column, for all the 8 ports. If I put in another card, then it shows an 'OUT OF SERVICE' message in the status column.

When RASExpress boots, it should show loading firmware messages to the ISI card. If you do not have modems connected to the RS232 port, the port will be disabled or out of service depending on the status of the unknown EIA signals on the RS232 ports.