NOTE: On the diagnostic screen, the errors "Bad CMOS File Exists!" and "CMOS is Still Bad!" are not valid errors. These errors show up in every version of software, and is related to Y2K problems. This will not impact the function of the console whatsoever.
The second most common cause of ISA960 failures is low DC voltages. Open the case and find the main motherboard power connector. Put a meter on the red and black wires. If it is any less than 5 volts, there is a very good chance that voltage is dropping over a DC connection. With the meter still on the main DC 5V line, wiggle the power connector coming out of the power supply on the power distro board. Then wiggle the hard drive connections. If you see the voltage suddenly pop back up to proper voltage, then you have some corrosion on the connections. The biggest killer of almost all electronics is corroded low voltage DC connections and the 5 volt line is the first to be hit, which makes the ISA960 card the first thing to go. Replacing the main DC power harness is a very common repair for equipment of this age, but it is also helpful to eliminate the CPU fansink's hard drive power splice connector, which also drops voltage very commonly. CPU fan power harness can be landed on the motherboard's fan connection beside the RAM. The pin-out of the motherboard's fan connector is GND/12V/GND, with the red wire is in the middle.
If your processor hasn't seen repair in a while, it would be a good idea to send it in, and our repair technicians will inspect all of the power harnesses, resolder a few things and make sure that all the inherent wear and tear is dealt with. It is usually a fairly inexpensive repair unless there is a trouble PCB, which is rare. Errors on a hard drive resulting in replacement could be a little expensive, but not too bad. Most of the repairs done Obsession 2s are covered under ECOs, and typically free.
There are no user serviceable items on the ISA960 card to check other than makings sure connections are tight. If the card edge is lifted near the edge of the case, look underneath to make sure than the bottom of the card's metal flange is not stuck on the case, although this has never been observed to be an issue.